chore(deps): bump werkzeug in /tests/apps/python-flask

Bumps [werkzeug](https://github.com/pallets/werkzeug) from 3.1.8 to 3.1.9.
- [Release notes](https://github.com/pallets/werkzeug/releases)
- [Changelog](https://github.com/pallets/werkzeug/blob/main/CHANGES.rst)
- [Commits](https://github.com/pallets/werkzeug/compare/3.1.8...3.1.9)

---
updated-dependencies:
- dependency-name: werkzeug
  dependency-version: 3.1.9
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

tests/apps/python-flask/requirements.txt

@@ -1,5 +1,5 @@
 Flask==3.1.3
 Jinja2==3.1.6
-Werkzeug==3.1.8
+Werkzeug==3.1.9
 gunicorn==26.2.0