ci: bump pip from 24.2 to 25.3 in /.github/workflows

Bumps [pip](https://github.com/pypa/pip) from 24.2 to 25.3.
- [Changelog](https://github.com/pypa/pip/blob/main/NEWS.rst)
- [Commits](https://github.com/pypa/pip/compare/24.2...25.3)

---
updated-dependencies:
- dependency-name: pip
  dependency-version: '25.3'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

.github/workflows/constraints.txt

@@ -1,4 +1,4 @@
-pip==24.2
+pip==25.3
 nox==2024.10.9
 nox-poetry==1.0.3
 poetry==1.8.4

.github/workflows/tests.yml

@@ -60,7 +60,7 @@ jobs:
             fh.write(f"result={result}\n")
 
       - name: Restore pre-commit cache
-        uses: actions/cache@v4.3.0
+        uses: actions/cache@v4.1.2
         if: matrix.session == 'pre-commit'
         with:
           path: ~/.cache/pre-commit