Bump pip from 25.2 to 25.3 in /utils/google_app_engine in the pip group across 1 directory (#13686)

Bump pip in /utils/google_app_engine in the pip group across 1 directory

Bumps the pip group with 1 update in the /utils/google_app_engine directory: [pip](https://github.com/pypa/pip).


Updates `pip` from 25.2 to 25.3
- [Changelog](https://github.com/pypa/pip/blob/main/NEWS.rst)
- [Commits](https://github.com/pypa/pip/compare/25.2...25.3)

---
updated-dependencies:
- dependency-name: pip
  dependency-version: '25.3'
  dependency-type: direct:production
  dependency-group: pip
...

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