Fix CI: install dev dependencies with uv sync

Author: itomek

.github/workflows/test.yml

@@ -23,7 +23,7 @@ jobs:
         uses: astral-sh/setup-uv@v5
 
       - name: Install test dependencies
-        run: uv sync
+        run: uv sync --extra dev
 
       - name: Run Dockerfile build tests
         run: |