Bump pip from 21.1 to 23.3 in /utils/google_app_engine (#12316)

Bumps [pip](https://github.com/pypa/pip) from 21.1 to 23.3.
- [Changelog](https://github.com/pypa/pip/blob/main/NEWS.rst)
- [Commits](https://github.com/pypa/pip/compare/21.1...23.3)

---
updated-dependencies:
- dependency-name: pip
  dependency-type: direct:production
...

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utils/google_app_engine/additional_requirements.txt

@@ -1,5 +1,5 @@
 # add these requirements in your app on top of the existing ones
-pip==21.1
+pip==23.3
 Flask==2.3.2
 gunicorn==19.10.0
 werkzeug>=3.0.1 # not directly required, pinned by Snyk to avoid a vulnerability