fix: add permissions for release-please job

The release-please job needs contents:write and pull-requests:write
to create/update its release PR git tree via the GitHub API.

Made-with: Cursor

Author: nieblara

.github/workflows/release-please.yml

@@ -10,6 +10,9 @@ jobs:
   release-please:
     runs-on: ubuntu-latest
     if: github.event_name == 'push'
+    permissions:
+      contents: write
+      pull-requests: write
     outputs:
       release_created: ${{ steps.release.outputs.release_created }}
       tag_name: ${{ steps.release.outputs.tag_name }}