chore: update frequency of branch-cleanup job

Author: psturc

.github/workflows/delete-old-branches.yml

@@ -14,7 +14,7 @@ jobs:
         uses: beatlabs/delete-old-branches-action@v0.0.10
         with:
           repo_token: ${{ github.token }}
-          date: '1 month ago'
+          date: '1 week ago'
           dry_run: false
           extra_protected_branch_regex: ^(main)$
           exclude_open_pr_branches: false