ci: add --skip-existing to uv publish to avoid duplicate version failures

Author: barrelc

.github/workflows/release.yml

@@ -43,4 +43,4 @@ jobs:
       - name: Publish to PyPI
         env:
           UV_PUBLISH_TOKEN: ${{ secrets.PYPI }}
-        run: uv publish
+        run: uv publish --skip-existing