Bump grpc-stubs from 1.53.0.5 to 1.53.0.6 (#137)

Bumps [grpc-stubs](https://github.com/shabbyrobe/grpc-stubs) from
1.53.0.5 to 1.53.0.6.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/shabbyrobe/grpc-stubs/commit/840a029820b16e48f093e5b28d4bcbac34df338b"><code>840a029</code></a>
Tag final archived version 1.53.0.6</li>
<li><a
href="https://github.com/shabbyrobe/grpc-stubs/commit/6e9e2c7251e5378ade059f111fc8e852b95650e3"><code>6e9e2c7</code></a>
Add date to archive notice</li>
<li><a
href="https://github.com/shabbyrobe/grpc-stubs/commit/26c04aa7332786b02d1eeb53b79d5697e2dc9b0b"><code>26c04aa</code></a>
Remove Python 3.7 builder</li>
<li><a
href="https://github.com/shabbyrobe/grpc-stubs/commit/f1396b3f544b4b47dee02b585cfd850c29964830"><code>f1396b3</code></a>
Add archive notice to README</li>
<li><a
href="https://github.com/shabbyrobe/grpc-stubs/commit/b6db57ef3729e1184808d64b35e8b932b69c2b9c"><code>b6db57e</code></a>
Fix deploy script</li>
<li>See full diff in <a
href="https://github.com/shabbyrobe/grpc-stubs/compare/1.53.0.5...1.53.0.6">compare
view</a></li>
</ul>
</details>
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Author: matthias-wende-frequenz

pyproject.toml

@@ -81,7 +81,7 @@ dev-mkdocs = [
 ]
 dev-mypy = [
   "mypy == 1.16.0",
-  "grpc-stubs == 1.53.0.5",
+  "grpc-stubs == 1.53.0.6",
   "pandas-stubs == 2.2.3.250308",
   "types-Markdown == 3.8.0.20250415",
   "types-protobuf == 5.29.1.20250403",