build(deps): bump typing-extensions in /docker/test-shadow

Bumps [typing-extensions](https://github.com/python/typing_extensions) from 4.8.0 to 4.12.2.
- [Release notes](https://github.com/python/typing_extensions/releases)
- [Changelog](https://github.com/python/typing_extensions/blob/main/CHANGELOG.md)
- [Commits](python/typing_extensions@4.8.0...4.12.2)

---
updated-dependencies:
- dependency-name: typing-extensions
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

docker/test-shadow/requirements.txt

@@ -18,7 +18,7 @@ markupsafe==2.1.3
     # via
     #   jinja2
     #   werkzeug
-typing-extensions==4.8.0
+typing-extensions==4.12.2
     # via test-shadow (pyproject.toml)
 werkzeug==3.0.1
     # via flask