chore: update GitHub Actions workflow permissions

[gibiw]

• Added write permissions for contents in the build-n-publish job of the Python package workflow.

This change ensures that the workflow has the necessary permissions to publish artifacts effectively.

---

Note

CI workflow update

• Adds permissions: contents: write to the build-n-publish job in .github/workflows/pythonpackage.yml

^{Written by Cursor Bugbot for commit 2feff6b. This will update automatically on new commits. Configure here.}