ci: try using tox-uv

Signed-off-by: Henry Schreiner <[email protected]>

Author: henryiii

.github/workflows/reusable-pytest.yml

@@ -68,10 +68,10 @@ jobs:
       - name: Setup python for tox
         uses: actions/setup-python@v5
         with:
-          python-version: 3.9
+          python-version: 3.12
 
       - name: Install tox
-        run: python -m pip install tox
+        run: python -m pip install tox tox-uv uv
 
       - name: Run test suite via tox
         if: matrix.tox-target == 'tox'