Bump pip from 25.3 to 26.0 in /utils/google_app_engine in the pip group across 1 directory (#13705)

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 25.3 to 26.0
- [Changelog](https://github.com/pypa/pip/blob/main/NEWS.rst)
- [Commits](pypa/pip@25.3...26.0)

---
updated-dependencies:
- dependency-name: pip
  dependency-version: '26.0'
  dependency-type: direct:production
  dependency-group: pip
...

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

Author: dependabot[bot]

utils/google_app_engine/additional_requirements.txt

@@ -1,5 +1,5 @@
 # add these requirements in your app on top of the existing ones
-pip==25.3
+pip==26.0
 Flask==2.3.2
 gunicorn==23.0.0
 werkzeug>=3.0.1 # not directly required, pinned by Snyk to avoid a vulnerability