Bump pip in /test/yolov7-tracker/utils/google_app_engine

Bumps [pip](https://github.com/pypa/pip) from 18.1 to 26.0.
- [Changelog](https://github.com/pypa/pip/blob/main/NEWS.rst)
- [Commits](https://github.com/pypa/pip/compare/18.1...26.0)

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

Signed-off-by: dependabot[bot] <support@github.com>

test/yolov7-tracker/utils/google_app_engine/additional_requirements.txt

@@ -1,4 +1,4 @@
 # add these requirements in your app on top of the existing ones
-pip==18.1
+pip==26.0
 Flask==1.0.2
 gunicorn==22.0.0