specify --extra cpu for CI run

Author: Aethor

.github/workflows/ci.yml

@@ -11,7 +11,7 @@ jobs:
         with:
           python-version: 3.9
       - name: Install dependencies
-        run: uv sync --dev
+        run: uv sync --dev --extra cpu
       - name: Run tests
         run: uv run pytest tests
       - name: Build documentation