Bump pip from 23.3 to 25.2 in /utils/google_app_engine (#13663)

Bumps [pip](https://github.com/pypa/pip) from 23.3 to 25.2.
- [Changelog](https://github.com/pypa/pip/blob/main/NEWS.rst)
- [Commits](https://github.com/pypa/pip/compare/23.3...25.2)

---
updated-dependencies:
- dependency-name: pip
  dependency-version: '25.2'
  dependency-type: direct:production
...

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