build(deps): bump mypy from 1.20.1 to 1.20.2 in /clients/py (#676)

Bumps [mypy](https://github.com/python/mypy) from 1.20.1 to 1.20.2.
- [Changelog](https://github.com/python/mypy/blob/master/CHANGELOG.md)
- [Commits](python/mypy@v1.20.1...v1.20.2)

---
updated-dependencies:
- dependency-name: mypy
  dependency-version: 1.20.2
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

clients/py/optional-requirements.txt

@@ -1,7 +1,7 @@
 flake8==7.3.0
 iniconfig==2.3.0
 mccabe==0.7.0
-mypy==1.20.1
+mypy==1.20.2
 mypy-extensions==1.1.0
 packaging==26.1
 pluggy==1.6.0