chore: update merge action

Author: simoneb

.github/workflows/ci.yml

@@ -12,15 +12,18 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions/setup-node@v2
         with:
-          node-version: 14.x
+          node-version: 16
       - run: npm ci
       - run: npm run lint
       - run: npm test -- --coverage
       - run: bash <(curl -s https://codecov.io/bash)
   automerge:
     needs: build
     runs-on: ubuntu-latest
+    permissions:
+      pull-requests: write
+      contents: write    
     steps:
-      - uses: fastify/github-action-merge-dependabot@v2.7.0
+      - uses: fastify/github-action-merge-dependabot@v3
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}