chore: Fixes permissions for dependabot cleanup job (#4408)

Author: pan-kot

.github/workflows/dependabot-lockfile-cleanup.yml

@@ -9,3 +9,5 @@ jobs:
   cleanup:
     uses: cloudscape-design/actions/.github/workflows/dependabot-lockfile-cleanup.yml@main
     secrets: inherit
+    permissions:
+      contents: write