Bump pip from 25.3 to 26.0

Bumps [pip](https://github.com/pypa/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
...

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

Author: dependabot[bot]

requirements.txt

@@ -8,7 +8,7 @@ tox==4.5.1
 virtualenv~=20.36.1
 Sphinx==7.3.7
 sphinxcontrib-websupport==1.2.7
-pip==25.3
+pip==26.0
 build==0.10.0
 wheel==0.45.1
 lxml==5.3.1