Support merge queues on dependabot PRs

From the `gh` cli docs:
```
gh pr merge --help
Merge a pull request on GitHub.

Without an argument, the pull request that belongs to the current branch
is selected.

When targeting a branch that requires a merge queue, no merge strategy is required.
If required checks have not yet passed, auto-merge will be enabled.
If required checks have passed, the pull request will be added to the merge queue.
```

Author: creydr

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

@@ -16,13 +16,13 @@ jobs:
         with:
           github-token: "${{ secrets.GITHUB_TOKEN }}"
 
-      - name: Enable auto-merge for minor and patch updates
+      - name: Enable merge for minor and patch updates
         if: |
           steps.metadata.outputs.update-type == 'version-update:semver-minor' ||
           steps.metadata.outputs.update-type == 'version-update:semver-patch'
         run: |
-          gh pr merge --auto --squash "$PR_URL"
-          gh pr comment "$PR_URL" --body "✅ Auto-merge enabled. This PR will merge automatically once all checks pass."
+          gh pr merge "$PR_URL"
+          gh pr comment "$PR_URL" --body "✅ Auto-merge enabled. This PR will merge automatically / added to merge queue, once all checks pass."
         env:
           PR_URL: ${{ github.event.pull_request.html_url }}
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}