Bump actions/setup-python from 5 to 6

Bumps [actions/setup-python](https://github.com/actions/setup-python) from 5 to 6.
- [Release notes](https://github.com/actions/setup-python/releases)
- [Commits](https://github.com/actions/setup-python/compare/v5...v6)

---
updated-dependencies:
- dependency-name: actions/setup-python
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

.github/workflows/backup.yml

@@ -12,7 +12,7 @@ jobs:
 
     steps:
       - name: Configure cache
-        uses: actions/cache@v5
+        uses: actions/cache@v4
         with:
           path: |
             ${{ env.GITHUB_WORKSPACE }}
@@ -20,7 +20,7 @@ jobs:
           key: ${{ runner.os }}
 
       - name: Install the correct Python version
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6
         with:
           python-version: '3.x'