Bump pip from 26.0.1 to 26.1.1 in /.github/workflows

Bumps [pip](https://github.com/pypa/pip) from 26.0.1 to 26.1.1.
- [Changelog](https://github.com/pypa/pip/blob/main/NEWS.rst)
- [Commits](pypa/pip@26.0.1...26.1.1)

---
updated-dependencies:
- dependency-name: pip
  dependency-version: 26.1.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

.github/workflows/constraints.txt

@@ -1,4 +1,4 @@
-pip==26.0.1
+pip==26.1.1
 pre-commit==4.5.1
 black==26.3.1
 flake8==7.3.0