fix: bump pypa/gh-action-pypi-publish to v1.12.3 for metadata v2.4 support

The v1.8.11 action only supports metadata up to v2.2, but newer
setuptools generates v2.4 metadata, causing PyPI publish to fail
with "Metadata is missing required fields" error.

Author: hardbyte

.github/workflows/ci.yaml

@@ -98,12 +98,12 @@ jobs:
     # upload to PyPI only on release
     if: github.event.release && github.event.action == 'published'
     steps:
-      - uses: actions/download-artifact@v4.1.7
+      - uses: actions/download-artifact@v4
         with:
           name: dist
           path: dist
 
-      - uses: pypa/gh-action-pypi-publish@v1.8.11
+      - uses: pypa/gh-action-pypi-publish@v1.12.3
         with:
           user: __token__
           password: ${{ secrets.PYPI_API_TOKEN }}