Build(deps): Bump the actions group with 1 update (#461)

Bumps the actions group with 1 update: [actions/cache](https://github.com/actions/cache).


Updates `actions/cache` from 3 to 4
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](actions/cache@v3...v4)

---
updated-dependencies:
- dependency-name: actions/cache
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: actions
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/create-milestone.yml

@@ -64,7 +64,7 @@ jobs:
           python-version: ${{ env.MAIN_PYTHON_VERSION }}
 
       - name: Linux pip cache
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         if: ${{ runner.os == 'Linux' }}
         with:
           path: ~/.cache/pip