[Dependency] Bump github.com/hashicorp/terraform-plugin-mux from 0.19.0 to 0.20.0 (#4742)

Bumps
[github.com/hashicorp/terraform-plugin-mux](https://github.com/hashicorp/terraform-plugin-mux)
from 0.19.0 to 0.20.0.
<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>v0.20.0</h2>
<p>BUG FIXES:</p>
<ul>
<li>all: Fixed a bug where muxed provider servers were not enforced to
implement <code>GetResourceIdentitySchemas</code>, which is required by
Terraform v1.12.1 in the scenario where at least one of the muxed
provider servers supports identity. Before upgrading this dependency the
Go modules that support identity should also be upgraded to prevent
confusing errors, which are: [email protected],
[email protected], terraform-plugin-sdk/[email protected], and
[email protected]. (<a
href="https://redirect.github.com/hashicorp/terraform-plugin-mux/issues/307">#307</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>0.20.0 (May 21, 2025)</h2>
<p>BUG FIXES:</p>
<ul>
<li>all: Fixed a bug where muxed provider servers were not enforced to
implement <code>GetResourceIdentitySchemas</code>, which is required by
Terraform v1.12.1 in the scenario where at least one of the muxed
provider servers supports identity. Before upgrading this dependency the
Go modules that support identity should also be upgraded to prevent
confusing errors, which are: [email protected],
[email protected], terraform-plugin-sdk/[email protected], and
[email protected]. (<a
href="https://redirect.github.com/hashicorp/terraform-plugin-mux/issues/307">#307</a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/hashicorp/terraform-plugin-mux/commit/101e9dfd0787e782fc4d0869931716180da5df09"><code>101e9df</code></a>
Update changelog</li>
<li><a
href="https://github.com/hashicorp/terraform-plugin-mux/commit/e2f2af1a13b5ee6648724f3af068b016aea60859"><code>e2f2af1</code></a>
Update <code>terraform-plugin-go</code> and add changelogs for
<code>v0.20.0</code> release (<a
href="https://redirect.github.com/hashicorp/terraform-plugin-mux/issues/307">#307</a>)</li>
<li><a
href="https://github.com/hashicorp/terraform-plugin-mux/commit/4351d2911538e6cea95a2bca4564b7db6ec01526"><code>4351d29</code></a>
Create pull_request_template.md (<a
href="https://redirect.github.com/hashicorp/terraform-plugin-mux/issues/306">#306</a>)</li>
<li>See full diff in <a
href="https://github.com/hashicorp/terraform-plugin-mux/compare/v0.19.0...v0.20.0">compare
view</a></li>
</ul>
</details>
<br />


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NO_CHANGELOG=true

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Author: dependabot[bot]

go.mod

@@ -11,9 +11,9 @@ require (
 	github.com/hashicorp/terraform-json v0.25.0
 	github.com/hashicorp/terraform-plugin-framework v1.15.0
 	github.com/hashicorp/terraform-plugin-framework-validators v0.18.0
-	github.com/hashicorp/terraform-plugin-go v0.27.0
+	github.com/hashicorp/terraform-plugin-go v0.28.0
 	github.com/hashicorp/terraform-plugin-log v0.9.0
-	github.com/hashicorp/terraform-plugin-mux v0.19.0
+	github.com/hashicorp/terraform-plugin-mux v0.20.0
 	github.com/hashicorp/terraform-plugin-sdk/v2 v2.37.0
 	github.com/hashicorp/terraform-plugin-testing v1.13.0
 	github.com/stretchr/testify v1.10.0

go.sum

@@ -119,12 +119,12 @@ github.com/hashicorp/terraform-plugin-framework v1.15.0 h1:LQ2rsOfmDLxcn5EeIwdXF
 github.com/hashicorp/terraform-plugin-framework v1.15.0/go.mod h1:hxrNI/GY32KPISpWqlCoTLM9JZsGH3CyYlir09bD/fI=
 github.com/hashicorp/terraform-plugin-framework-validators v0.18.0 h1:OQnlOt98ua//rCw+QhBbSqfW3QbwtVrcdWeQN5gI3Hw=
 github.com/hashicorp/terraform-plugin-framework-validators v0.18.0/go.mod h1:lZvZvagw5hsJwuY7mAY6KUz45/U6fiDR0CzQAwWD0CA=
-github.com/hashicorp/terraform-plugin-go v0.27.0 h1:ujykws/fWIdsi6oTUT5Or4ukvEan4aN9lY+LOxVP8EE=
-github.com/hashicorp/terraform-plugin-go v0.27.0/go.mod h1:FDa2Bb3uumkTGSkTFpWSOwWJDwA7bf3vdP3ltLDTH6o=
+github.com/hashicorp/terraform-plugin-go v0.28.0 h1:zJmu2UDwhVN0J+J20RE5huiF3XXlTYVIleaevHZgKPA=
+github.com/hashicorp/terraform-plugin-go v0.28.0/go.mod h1:FDa2Bb3uumkTGSkTFpWSOwWJDwA7bf3vdP3ltLDTH6o=
 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 v0.19.0 h1:F2QxnHfsvdoWbF7EWeEHA+sfmBetlW5pipq+zWnVdIc=
-github.com/hashicorp/terraform-plugin-mux v0.19.0/go.mod h1:MO+7zYzrMz2Ohc5r8m7sM6YT+F8ET4lgYKe2GhiYW0g=
+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-sdk/v2 v2.37.0 h1:NFPMacTrY/IdcIcnUB+7hsore1ZaRWU9cnB6jFoBnIM=
 github.com/hashicorp/terraform-plugin-sdk/v2 v2.37.0/go.mod h1:QYmYnLfsosrxjCnGY1p9c7Zj6n9thnEE+7RObeYs3fA=
 github.com/hashicorp/terraform-plugin-testing v1.13.0 h1:vTELm6x3Z4H9VO3fbz71wbJhbs/5dr5DXfIwi3GMmPY=