Bump pip from 25.0.1 to 25.1 in /docs

Bumps [pip](https://github.com/pypa/pip) from 25.0.1 to 25.1.
- [Changelog](https://github.com/pypa/pip/blob/main/NEWS.rst)
- [Commits](pypa/pip@25.0.1...25.1)

---
updated-dependencies:
- dependency-name: pip
  dependency-version: '25.1'
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

docs/requirements_pip.txt

@@ -1,2 +1,2 @@
-pip==25.0.1
+pip==25.1
 wheel==0.45.1