chore: fix permissions for release-please (#97)

Author: TomAFrench

.github/workflows/release.yml

@@ -12,6 +12,9 @@ jobs:
       release-pr: ${{ steps.release.outputs.pr }}
       tag-name: ${{ steps.release.outputs.tag_name }}
     runs-on: ubuntu-latest
+    permissions:
+      contents: write
+      pull-requests: write
     steps:
       - name: Run release-please
         id: release