chore(deps-dev): update mypy-protobuf requirement in /sdk (#38)

Updates the requirements on [mypy-protobuf](https://github.com/nipunn1313/mypy-protobuf) to permit the latest version.
- [Changelog](https://github.com/nipunn1313/mypy-protobuf/blob/main/CHANGELOG.md)
- [Commits](nipunn1313/mypy-protobuf@v3.6.0...v5.1.0)

---
updated-dependencies:
- dependency-name: mypy-protobuf
  dependency-version: 5.1.0
  dependency-type: direct:development
...

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Author: dependabot[bot]

sdk/pyproject.toml

@@ -33,7 +33,7 @@ dev = [
     "pytest-cov>=7.1.0",
     "pytest-asyncio>=1.3.0",
     "mypy>=2.0.0",
-    "mypy-protobuf>=3.6",
+    "mypy-protobuf>=5.1.0",
     "ruff>=0.15.12",
     "grpcio-tools>=1.80.0",
 ]