chore(deps): bump werkzeug in /cloud_scheduler/snippets (#13715)

Bumps [werkzeug](https://github.com/pallets/werkzeug) from 3.0.6 to 3.1.5.
- [Release notes](https://github.com/pallets/werkzeug/releases)
- [Changelog](https://github.com/pallets/werkzeug/blob/main/CHANGES.rst)
- [Commits](pallets/werkzeug@3.0.6...3.1.5)

---
updated-dependencies:
- dependency-name: werkzeug
  dependency-version: 3.1.5
  dependency-type: direct:production
...

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

Author: dependabot[bot]

cloud_scheduler/snippets/requirements.txt

@@ -1,4 +1,4 @@
 Flask==3.0.3
 gunicorn==23.0.0
 google-cloud-scheduler==2.14.1
-Werkzeug==3.0.6
+Werkzeug==3.1.5