chore: update contentful/github-auto-merge action to v2 (#396)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/auto-merge.yml

@@ -10,6 +10,6 @@ jobs:
     runs-on: ubuntu-latest
     if: github.actor == 'dependabot[bot]'
     steps:
-      - uses: contentful/github-auto-merge@v1
+      - uses: contentful/github-auto-merge@v2
         with:
           VAULT_URL: ${{ secrets.VAULT_URL }}