ci: fix linting and limit to dev branch

Author: sgratzl

.github/workflows/dependabot_automerge.yml

@@ -1,5 +1,8 @@
 name: Dependabot auto-merge
-on: pull_request
+on:
+  pull_request:
+    branches:
+      - 'dev' # only into dev
 
 permissions:
   contents: write
@@ -14,7 +17,7 @@ jobs:
         id: metadata
         uses: dependabot/fetch-metadata@v2
         with:
-          github-token: "${{ secrets.GITHUB_TOKEN }}"
+          github-token: '${{ secrets.GITHUB_TOKEN }}'
       - name: Enable auto-merge for Dependabot PRs
         # patch only
         if: steps.metadata.outputs.update-type == 'version-update:semver-patch'