Try installing uv for GHA

Author: schloerke

.github/workflows/ci.yaml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - uses: actions/setup-python@v5
+      - uses: astral-sh/setup-uv@v3
       - run: make lint
       - run: make fmt