chore: explicitly define release-please permissions (#49)

Author: legendecas

.github/workflows/release-please.yml

@@ -11,6 +11,9 @@ jobs:
     runs-on: ubuntu-latest
     outputs:
       release_created:  ${{ steps.release.outputs.release_created }}
+    permissions:
+      contents: write
+      pull-requests: write
     steps:
       - uses: googleapis/release-please-action@v4
         id: release