fix: install uv in CI workflow

Author: ServerSideHannes

.github/workflows/test.yml

@@ -23,8 +23,11 @@ jobs:
           python-version: '3.14'
           cache: 'pip'
 
+      - name: Install uv
+        run: pip install uv
+
       - name: Install dependencies
-        run: pip install -e ".[dev]"
+        run: uv sync --frozen
 
       - name: Run all tests
         run: make test-all