pip dev(deps-dev): bump types-pyyaml in /eng

Bumps [types-pyyaml](https://github.com/python/typeshed) from 6.0.12.8 to 6.0.12.20241230.
- [Commits](https://github.com/python/typeshed/commits)

---
updated-dependencies:
- dependency-name: types-pyyaml
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

packages/typespec-python/dev_requirements.txt

@@ -9,7 +9,7 @@ pytest==8.3.2
 coverage==7.6.1
 black==24.8.0
 ptvsd==4.3.2
-types-PyYAML==6.0.12.8
+types-PyYAML==6.0.12.20241230
 
 # additional dependency needed for development
 setuptools