Bump distlib from 0.4.2 to 0.4.3 in /sdks/python (#38959)

Bumps [distlib](https://github.com/pypa/distlib) from 0.4.2 to 0.4.3.
- [Release notes](https://github.com/pypa/distlib/releases)
- [Changelog](https://github.com/pypa/distlib/blob/master/CHANGES.rst)
- [Commits](pypa/distlib@0.4.2...0.4.3)

---
updated-dependencies:
- dependency-name: distlib
  dependency-version: 0.4.3
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

sdks/python/pyproject.toml

@@ -28,7 +28,7 @@ requires = [
     "grpcio-tools==1.71.0; python_version >= '3.13'",
     "mypy-protobuf==3.5.0",
     # Avoid https://github.com/pypa/virtualenv/issues/2006
-    "distlib==0.4.2",
+    "distlib==0.4.3",
     # Numpy headers
     "numpy>=1.14.3,<2.5.0", # Update setup.py as well.
     # having cython here will create wheels that are platform dependent.