Updating dependabot-approve-merge.yml workflow from template

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

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

@@ -1,5 +1,15 @@
+# This workflow is provided via the organization template repository
+#
+# https://github.com/nextcloud/.github
+# https://docs.github.com/en/actions/learn-github-actions/sharing-workflows-with-your-organization
+
 name: Dependabot
-on: pull_request_target
+
+on:
+  pull_request_target:
+     branches:
+      - master
+      - stable*
 
 jobs:
   auto-merge:
@@ -7,15 +17,13 @@ jobs:
     steps:
       # Default github action approve
       - uses: hmarr/auto-approve-action@v2.0.0
-        if: github.ref == 'refs/heads/master' &&
-            (github.actor == 'dependabot[bot]' || github.actor == 'dependabot-preview[bot]')
+        if: github.actor == 'dependabot[bot]' || github.actor == 'dependabot-preview[bot]'
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}
 
       # Nextcloud bot approve and merge request
-      - uses: ahmadnassri/action-dependabot-auto-merge@v2
-        if: github.ref == 'refs/heads/master' &&
-            (github.actor == 'dependabot[bot]' || github.actor == 'dependabot-preview[bot]')
+      - uses: ahmadnassri/action-dependabot-auto-merge@v1
+        if: github.actor == 'dependabot[bot]' || github.actor == 'dependabot-preview[bot]'
         with:
           target: minor
           github-token: ${{ secrets.DEPENDABOT_AUTOMERGE_TOKEN }}