Don't automerge major updates

Author: distantcam

.github/workflows/pr.yml

@@ -26,7 +26,9 @@ jobs:
         uses: dependabot/fetch-metadata@v2
 
       - name: ✔️ Merge PR
-        if: steps.dependabot-metadata.outputs.dependency-group == 'tunit'
+        if: |
+          steps.dependabot-metadata.outputs.dependency-group == 'tunit'
+          && steps.dependabot-metadata.outputs.update-type != 'version-update:semver-major'
         run: gh pr merge --auto --merge "$PR_URL"
         env:
           PR_URL: ${{ github.event.pull_request.html_url }}