Py version was wrong

Author: molpopgen

.github/workflows/python.yml

@@ -40,7 +40,7 @@ jobs:
           cargo run --example json_metadata --features derive
       - name: setup Python and run tests
         run: |
-          uv venv -p 3.12
+          uv venv -p ${{ matrix.python }}
           source .venv/bin/activate
           uv pip install -r python/requirements_locked_3_13.txt
           python -m pytest python