revert: restore correct PYPY_API_TOKEN secret name

The secret name is actually PYPY_API_TOKEN, not PYPI_API_TOKEN.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: bokelley

.github/workflows/release-please.yml

@@ -43,5 +43,5 @@ jobs:
         if: ${{ steps.release.outputs.release_created }}
         env:
           TWINE_USERNAME: __token__
-          TWINE_PASSWORD: ${{ secrets.PYPI_API_TOKEN }}
+          TWINE_PASSWORD: ${{ secrets.PYPY_API_TOKEN }}
         run: twine upload dist/*