Update dependabot-auto-merge.yml

Author: lorisleiva

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

@@ -10,6 +10,11 @@ jobs:
     runs-on: ubuntu-latest
     if: github.event.pull_request.user.login == 'dependabot[bot]' && github.repository == 'codama-idl/codama'
     steps:
+      - name: Auto-approve the PR
+        run: gh pr review --approve "$PR_URL"
+        env:
+          PR_URL: ${{ github.event.pull_request.html_url }}
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
       - name: Enable auto-merge
         run: gh pr merge --auto --squash "$PR_URL"
         env: