chore(CI): Updating dependabot-approve-merge.yml workflow from template

Signed-off-by: Nextcloud bot <bot@nextcloud.com>

.github/workflows/dependabot-approve-merge.yml

@@ -13,6 +13,7 @@ on:
     branches:
       - main
       - master
+      - stable*
 
 permissions:
   contents: read