Update to use uv

Author: bmoscon

.github/workflows/tests.yml

@@ -20,7 +20,8 @@ jobs:
           python-version: ${{ matrix.python-version }}
       - name: Install dependencies
         run: |
-          uv pip install pytest cython --system
+          uv sync
+          uv pip install pytest
           uv pip install -e .
       - name: Test with pytest
         run: |