in pytest_matrix, use uv instead of pip

Author: hovey

.github/workflows/ci.yml

@@ -335,12 +335,14 @@ jobs:
         uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python-version }}
-          cache: "pip"
+
+      - name: Install uv
+        uses: astral-sh/setup-uv@v1
+        with:
+          enable-cache: true
 
       - name: Install dependencies
-        run: |
-          python -m pip install --upgrade pip
-          pip install .[dev]
+        run: uv pip install .[dev]
 
       - name: Run tests
         run: |