ci: Bump pip from 24.3.1 to 25.0 in /.github/workflows in the ci group

Bumps the ci group in /.github/workflows with 1 update: [pip](https://github.com/pypa/pip).


Updates `pip` from 24.3.1 to 25.0
- [Changelog](https://github.com/pypa/pip/blob/main/NEWS.rst)
- [Commits](pypa/pip@24.3.1...25.0)

---
updated-dependencies:
- dependency-name: pip
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: ci
...

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

.github/workflows/constraints.txt

@@ -1 +1 @@
-pip==24.3.1
+pip==25.0