[MNT] Bump crs-k/stale-branches in the github-actions group (#329)

Bumps the github-actions group with 1 update: [crs-k/stale-branches](https://github.com/crs-k/stale-branches).


Updates `crs-k/stale-branches` from 6.0.2 to 7.0.0
- [Release notes](https://github.com/crs-k/stale-branches/releases)
- [Commits](crs-k/stale-branches@v6.0.2...v7.0.0)

---
updated-dependencies:
- dependency-name: crs-k/stale-branches
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: github-actions
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Matthew Middlehurst <pfm15hbu@gmail.com>

Author: dependabot[bot]

.github/workflows/periodic_github_maintenace.yml

@@ -26,7 +26,7 @@ jobs:
           private-key: ${{ secrets.PR_APP_KEY }}
 
       - name: Stale Branches
-        uses: crs-k/stale-branches@v6.0.2
+        uses: crs-k/stale-branches@v7.0.0
         with:
           repo-token: ${{ steps.app-token.outputs.token }}
           days-before-stale: 365