Update protobuf requirement from <6,>=5.29.3 to >=5.29.3,<7 (#157)

Updates the requirements on
[protobuf](https://github.com/protocolbuffers/protobuf) to permit the
latest version.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/protocolbuffers/protobuf/commit/43e1626812c1b543e56a7bec59dc09eb18248bd2"><code>43e1626</code></a>
Updating version.json and repo version numbers to: 30.2</li>
<li><a
href="https://github.com/protocolbuffers/protobuf/commit/7a4c63bac3451b8adf8dd51e9c16ed74d4cbc662"><code>7a4c63b</code></a>
Fix lite classes in the protobuf-java Maven release to be JDK8
compatible. (#...</li>
<li><a
href="https://github.com/protocolbuffers/protobuf/commit/783166965aa8808ec1b74d4890088e3b0799ac08"><code>7831669</code></a>
Remove dllexport attribute on variable definition. (<a
href="https://redirect.github.com/protocolbuffers/protobuf/issues/20833">#20833</a>)</li>
<li><a
href="https://github.com/protocolbuffers/protobuf/commit/da9cadcb975654e3d158796b642ec27ba5f4509d"><code>da9cadc</code></a>
Restore JDK8 compatibility in Bazel for libraries with dependencies from
Mave...</li>
<li><a
href="https://github.com/protocolbuffers/protobuf/commit/09b5078524d60917d1fa8c635bcee52e608f2f04"><code>09b5078</code></a>
Add protobuf_maven artifacts to protobuf_maven_dev as well so they can
still ...</li>
<li><a
href="https://github.com/protocolbuffers/protobuf/commit/b7f06f1ed07a463a9279f7019653fe6c3e90282d"><code>b7f06f1</code></a>
Add volatile to featuresResolved (<a
href="https://redirect.github.com/protocolbuffers/protobuf/issues/20766">#20766</a>)</li>
<li><a
href="https://github.com/protocolbuffers/protobuf/commit/b69f653d6ebc90d88032b8cc82d626758a74ef77"><code>b69f653</code></a>
Restore generator headers in cmake install until the next breaking C++
releas...</li>
<li><a
href="https://github.com/protocolbuffers/protobuf/commit/f4b0a79783aa1c579bfe005908f723fdc6d68169"><code>f4b0a79</code></a>
Restore custom protobuf maven namespaces to avoid polluting main maven
namesp...</li>
<li><a
href="https://github.com/protocolbuffers/protobuf/commit/2dc9f35e83f4b55e58443421266b0f9a158d91dd"><code>2dc9f35</code></a>
Fix Java concurrency issue in feature resolution for old &lt;=3.25.x
gencode usi...</li>
<li><a
href="https://github.com/protocolbuffers/protobuf/commit/221b2a0081ebdba6cf3b7278bf65528316ba4480"><code>221b2a0</code></a>
Change how we decide which empty string implementation to use. (<a
href="https://redirect.github.com/protocolbuffers/protobuf/issues/20708">#20708</a>)</li>
<li>Additional commits viewable in <a
href="https://github.com/protocolbuffers/protobuf/compare/v5.29.3...v6.30.2">compare
view</a></li>
</ul>
</details>
<br />


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>

Author: flora-hofmann-frequenz

pyproject.toml

@@ -31,7 +31,7 @@ dependencies = [
   "frequenz-api-reporting >= 0.7.0, < 0.8",
   "frequenz-client-common >= 0.3.0, < 0.4",
   "grpcio >=1.70.0, < 2",
-  "protobuf >=5.29.3, < 6",
+  "protobuf >= 5.29.3, < 7",
   "frequenz-client-base >= 0.8.0, < 0.10.0",
 ]
 dynamic = ["version"]