[Dependency] Bump github.com/hashicorp/terraform-plugin-mux from 0.20.0 to 0.21.0 (#5037)

Bumps
[github.com/hashicorp/terraform-plugin-mux](https://github.com/hashicorp/terraform-plugin-mux)
from 0.20.0 to 0.21.0.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/hashicorp/terraform-plugin-mux/releases">github.com/hashicorp/terraform-plugin-mux's
releases</a>.</em></p>
<blockquote>
<h2>v0.21.0</h2>
<p>NOTES:</p>
<ul>
<li>all: This Go module has been updated to Go 1.24 per the <a
href="https://go.dev/doc/devel/release#policy">Go support policy</a>. It
is recommended to review the <a href="https://go.dev/doc/go1.24">Go 1.24
release notes</a> before upgrading. Any consumers building on earlier Go
versions may experience errors. (<a
href="https://redirect.github.com/hashicorp/terraform-plugin-mux/issues/324">#324</a>)</li>
</ul>
<p>FEATURES:</p>
<ul>
<li>all: Upgraded mux server implementations to support action types.
(<a
href="https://redirect.github.com/hashicorp/terraform-plugin-mux/issues/314">#314</a>)</li>
<li>all: Upgraded mux server implementations to support the new list.
(<a
href="https://redirect.github.com/hashicorp/terraform-plugin-mux/issues/313">#313</a>)</li>
</ul>
<h2>v0.21.0-alpha.1</h2>
<p>NOTES:</p>
<ul>
<li>This alpha pre-release contains the <code>ListResource</code> RPC
which returns a list of resource identities for a single managed
resource type. (<a
href="https://redirect.github.com/hashicorp/terraform-plugin-mux/issues/313">#313</a>)</li>
<li>The <code>ListResource</code> and
<code>ValidateListResourceConfig</code> RPCs are considered experimental
and may change up until general availability. (<a
href="https://redirect.github.com/hashicorp/terraform-plugin-mux/issues/310">#310</a>)</li>
<li>This alpha pre-release contains the <code>Actions</code> RPC that
allows practitioners to specify and invoke non-CRUD, ad-hoc operations
that can cause changes to managed resources. (<a
href="https://redirect.github.com/hashicorp/terraform-plugin-mux/issues/314">#314</a>)</li>
<li>The <code>Actions</code> and <code>ValidateActionConfig</code> RPCs
are considered experimental and may change up until general
availability. (<a
href="https://redirect.github.com/hashicorp/terraform-plugin-mux/issues/317">#317</a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/hashicorp/terraform-plugin-mux/blob/main/CHANGELOG.md">github.com/hashicorp/terraform-plugin-mux's
changelog</a>.</em></p>
<blockquote>
<h2>0.21.0 (September 17, 2025)</h2>
<p>NOTES:</p>
<ul>
<li>all: This Go module has been updated to Go 1.24 per the <a
href="https://go.dev/doc/devel/release#policy">Go support policy</a>. It
is recommended to review the <a href="https://go.dev/doc/go1.24">Go 1.24
release notes</a> before upgrading. Any consumers building on earlier Go
versions may experience errors. (<a
href="https://redirect.github.com/hashicorp/terraform-plugin-mux/issues/324">#324</a>)</li>
</ul>
<p>FEATURES:</p>
<ul>
<li>all: Upgraded mux server implementations to support action types.
(<a
href="https://redirect.github.com/hashicorp/terraform-plugin-mux/issues/314">#314</a>)</li>
<li>all: Upgraded mux server implementations to support the new list.
(<a
href="https://redirect.github.com/hashicorp/terraform-plugin-mux/issues/313">#313</a>)</li>
</ul>
<h2>0.21.0-alpha.1 (July 31, 2025)</h2>
<p>NOTES:</p>
<ul>
<li>This alpha pre-release contains the <code>ListResource</code> RPC
which returns a list of resource identities for a single managed
resource type. (<a
href="https://redirect.github.com/hashicorp/terraform-plugin-mux/issues/313">#313</a>)</li>
<li>The <code>ListResource</code> and
<code>ValidateListResourceConfig</code> RPCs are considered experimental
and may change up until general availability. (<a
href="https://redirect.github.com/hashicorp/terraform-plugin-mux/issues/310">#310</a>)</li>
<li>This alpha pre-release contains the <code>Actions</code> RPC that
allows practitioners to specify and invoke non-CRUD, ad-hoc operations
that can cause changes to managed resources. (<a
href="https://redirect.github.com/hashicorp/terraform-plugin-mux/issues/314">#314</a>)</li>
<li>The <code>Actions</code> and <code>ValidateActionConfig</code> RPCs
are considered experimental and may change up until general
availability. (<a
href="https://redirect.github.com/hashicorp/terraform-plugin-mux/issues/317">#317</a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/hashicorp/terraform-plugin-mux/commit/b38198ff4fe4a7bf0e1fb79511cb487b165699f0"><code>b38198f</code></a>
Update changelog</li>
<li><a
href="https://github.com/hashicorp/terraform-plugin-mux/commit/8af620e77de3fe1a24fd8db9e2c276ab1601cb6c"><code>8af620e</code></a>
build(deps): bump github.com/hashicorp/terraform-plugin-go (<a
href="https://redirect.github.com/hashicorp/terraform-plugin-mux/issues/328">#328</a>)</li>
<li><a
href="https://github.com/hashicorp/terraform-plugin-mux/commit/dacc35af4584ab420f3fa42100b78b795415b9a9"><code>dacc35a</code></a>
add changelog for list (<a
href="https://redirect.github.com/hashicorp/terraform-plugin-mux/issues/327">#327</a>)</li>
<li><a
href="https://github.com/hashicorp/terraform-plugin-mux/commit/c551d8bf1c4f2b7faa7e4c831366e0696d3808fb"><code>c551d8b</code></a>
Simplify actions to one schema type (<a
href="https://redirect.github.com/hashicorp/terraform-plugin-mux/issues/325">#325</a>)</li>
<li><a
href="https://github.com/hashicorp/terraform-plugin-mux/commit/f55e317c3c875709dfe3135e5ff797ef95fa0b5b"><code>f55e317</code></a>
add action changelogs (<a
href="https://redirect.github.com/hashicorp/terraform-plugin-mux/issues/326">#326</a>)</li>
<li><a
href="https://github.com/hashicorp/terraform-plugin-mux/commit/3bb81ccf4c46f263eb04407d78d7eb31d6e5391c"><code>3bb81cc</code></a>
build(deps): bump the github-actions group with 2 updates (<a
href="https://redirect.github.com/hashicorp/terraform-plugin-mux/issues/324">#324</a>)</li>
<li><a
href="https://github.com/hashicorp/terraform-plugin-mux/commit/2483daa523e32a5b24e9f7d2b7680db630e53d1f"><code>2483daa</code></a>
actions: Remove unused action schema types and add linked resource
configs to...</li>
<li><a
href="https://github.com/hashicorp/terraform-plugin-mux/commit/27bdf681cb342990e5d9791638adcb11ed94c4ea"><code>27bdf68</code></a>
chore: remove old docs (<a
href="https://redirect.github.com/hashicorp/terraform-plugin-mux/issues/322">#322</a>)</li>
<li><a
href="https://github.com/hashicorp/terraform-plugin-mux/commit/6d917c2e860e4499ff242b52d156d316cc75849a"><code>6d917c2</code></a>
build(deps): bump the github-actions group with 2 updates (<a
href="https://redirect.github.com/hashicorp/terraform-plugin-mux/issues/321">#321</a>)</li>
<li><a
href="https://github.com/hashicorp/terraform-plugin-mux/commit/8c6b97f465753e0b9617da7e70a6fe14a636fdd5"><code>8c6b97f</code></a>
[CI] Update lock workflow file</li>
<li>Additional commits viewable in <a
href="https://github.com/hashicorp/terraform-plugin-mux/compare/v0.20.0...v0.21.0">compare
view</a></li>
</ul>
</details>
<br />


[![Dependabot compatibility
score](https://dependabot-badges.githubapp.com/badges/compatibility_score?dependency-name=github.com/hashicorp/terraform-plugin-mux&package-manager=go_modules&previous-version=0.20.0&new-version=0.21.0)](https://docs.github.com/en/github/managing-security-vulnerabilities/about-dependabot-security-updates#about-compatibility-scores)

Dependabot will resolve any conflicts with this PR as long as you don't
alter it yourself. You can also trigger a rebase manually by commenting
`@dependabot rebase`.

[//]: # (dependabot-automerge-start)
[//]: # (dependabot-automerge-end)

---

<details>
<summary>Dependabot commands and options</summary>
<br />

You can trigger Dependabot actions by commenting on this PR:
- `@dependabot rebase` will rebase this PR
- `@dependabot recreate` will recreate this PR, overwriting any edits
that have been made to it
- `@dependabot merge` will merge this PR after your CI passes on it
- `@dependabot squash and merge` will squash and merge this PR after
your CI passes on it
- `@dependabot cancel merge` will cancel a previously requested merge
and block automerging
- `@dependabot reopen` will reopen this PR if it is closed
- `@dependabot close` will close this PR and stop Dependabot recreating
it. You can achieve the same result by closing it manually
- `@dependabot show <dependency name> ignore conditions` will show all
of the ignore conditions of the specified dependency
- `@dependabot ignore this major version` will close this PR and stop
Dependabot creating any more for this major version (unless you reopen
the PR or upgrade to it yourself)
- `@dependabot ignore this minor version` will close this PR and stop
Dependabot creating any more for this minor version (unless you reopen
the PR or upgrade to it yourself)
- `@dependabot ignore this dependency` will close this PR and stop
Dependabot creating any more for this dependency (unless you reopen the
PR or upgrade to it yourself)


</details>

NO_CHANGELOG=true

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

go.mod

@@ -13,7 +13,7 @@ require (
 	github.com/hashicorp/terraform-plugin-framework-validators v0.18.0
 	github.com/hashicorp/terraform-plugin-go v0.29.0
 	github.com/hashicorp/terraform-plugin-log v0.9.0
-	github.com/hashicorp/terraform-plugin-mux v0.20.0
+	github.com/hashicorp/terraform-plugin-mux v0.21.0
 	github.com/hashicorp/terraform-plugin-sdk/v2 v2.38.0
 	github.com/hashicorp/terraform-plugin-testing v1.13.3
 	github.com/stretchr/testify v1.11.1

go.sum

@@ -124,8 +124,8 @@ github.com/hashicorp/terraform-plugin-go v0.29.0 h1:1nXKl/nSpaYIUBU1IG/EsDOX0vv+
 github.com/hashicorp/terraform-plugin-go v0.29.0/go.mod h1:vYZbIyvxyy0FWSmDHChCqKvI40cFTDGSb3D8D70i9GM=
 github.com/hashicorp/terraform-plugin-log v0.9.0 h1:i7hOA+vdAItN1/7UrfBqBwvYPQ9TFvymaRGZED3FCV0=
 github.com/hashicorp/terraform-plugin-log v0.9.0/go.mod h1:rKL8egZQ/eXSyDqzLUuwUYLVdlYeamldAHSxjUFADow=
-github.com/hashicorp/terraform-plugin-mux v0.20.0 h1:3QpBnI9uCuL0Yy2Rq/kR9cOdmOFNhw88A2GoZtk5aXM=
-github.com/hashicorp/terraform-plugin-mux v0.20.0/go.mod h1:wSIZwJjSYk86NOTX3fKUlThMT4EAV1XpBHz9SAvjQr4=
+github.com/hashicorp/terraform-plugin-mux v0.21.0 h1:QsEYnzSD2c3zT8zUrUGqaFGhV/Z8zRUlU7FY3ZPJFfw=
+github.com/hashicorp/terraform-plugin-mux v0.21.0/go.mod h1:Qpt8+6AD7NmL0DS7ASkN0EXpDQ2J/FnnIgeUr1tzr5A=
 github.com/hashicorp/terraform-plugin-sdk/v2 v2.38.0 h1:PQP7Crrc7t/ozj+P9x0/lsTzGNy3lVppH8zAJylofaE=
 github.com/hashicorp/terraform-plugin-sdk/v2 v2.38.0/go.mod h1:GQhpKVvvuwzD79e8/NZ+xzj+ZpWovdPAe8nfV/skwNU=
 github.com/hashicorp/terraform-plugin-testing v1.13.3 h1:QLi/khB8Z0a5L54AfPrHukFpnwsGL8cwwswj4RZduCo=