Update protobuf requirement from <5,>=4.25.3 to >=4.25.3,<6 (#62)

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/a978b75794a6ce4547c9db08a115c458d9190934"><code>a978b75</code></a>
Updating version.json and repo version numbers to: 27.0</li>
<li><a
href="https://github.com/protocolbuffers/protobuf/commit/f396506571fa1837704588b38cfb099f36c84fe3"><code>f396506</code></a>
MODULE.bazel fixes for protobuf BCR release. (<a
href="https://redirect.github.com/protocolbuffers/protobuf/issues/16927">#16927</a>)</li>
<li><a
href="https://github.com/protocolbuffers/protobuf/commit/4baa11fc6d0ca8ad3378a498bd38897eb139b96f"><code>4baa11f</code></a>
Merge pull request <a
href="https://redirect.github.com/protocolbuffers/protobuf/issues/16906">#16906</a>
from protocolbuffers/editions-27</li>
<li><a
href="https://github.com/protocolbuffers/protobuf/commit/4483c6bb28a117a3c9e635a5a87465278218b6c7"><code>4483c6b</code></a>
Lazily resolve features for proto2 and proto3 for compatibility with old
open...</li>
<li><a
href="https://github.com/protocolbuffers/protobuf/commit/f8a4a6880ec6453c5a9427a240169e917eacd3a3"><code>f8a4a68</code></a>
Fix whitespace merge issue in gencode</li>
<li><a
href="https://github.com/protocolbuffers/protobuf/commit/c3417f582fd3d1f825bde4edfd9dc8a9fb3ba65c"><code>c3417f5</code></a>
Regenerate stale files</li>
<li><a
href="https://github.com/protocolbuffers/protobuf/commit/fea6847e408d58e40a2f10ab124ae795afd703d4"><code>fea6847</code></a>
Future-proof edition 2023 against feature value support windows.</li>
<li><a
href="https://github.com/protocolbuffers/protobuf/commit/d2da4636c06ccad04371434dabbf24ca1c6ee83e"><code>d2da463</code></a>
Mark deleted fields in descriptor.proto reserved</li>
<li><a
href="https://github.com/protocolbuffers/protobuf/commit/0a05aa821527b343a414a81e68d3ee9cf50b4cfa"><code>0a05aa8</code></a>
Merge pull request <a
href="https://redirect.github.com/protocolbuffers/protobuf/issues/16875">#16875</a>
from protocolbuffers/ban-recursive-features</li>
<li><a
href="https://github.com/protocolbuffers/protobuf/commit/8c5f3a747bae377c92a780970416945c32780bfd"><code>8c5f3a7</code></a>
Prohibit using features in the same file they're defined in.</li>
<li>Additional commits viewable in <a
href="https://github.com/protocolbuffers/protobuf/compare/v4.25.3...v5.27.0">compare
view</a></li>
</ul>
</details>
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</details>

Author: Marenz

pyproject.toml

@@ -32,7 +32,7 @@ dependencies = [
   "frequenz-client-common >= 0.2.0, < 0.3",
   "grpcio >= 1.54.2, < 2",
   "grpcio-tools >= 1.54.2, < 2",
-  "protobuf >= 4.25.3, < 5",
+  "protobuf >= 4.25.3, < 6",
 ]
 dynamic = ["version"]