[ci] retry on pip install

.github/workflows/pytest-check.yml

@@ -28,7 +28,7 @@ jobs:
       - name: Install dependencies
         run: |
           pip install uv pip -U
-          uv pip install -r tests/requirements-tests.txt --system
+          uv pip install -r tests/requirements-tests.txt --system || uv pip install -r tests/requirements-tests.txt --system
           uv pip install vllm --no-build-isolation --system
       - name: Run tests
         run: pytest --cov --junit-xml=test-results.xml --splits 10 --group ${{ matrix.group }} --reruns 3 --only-rerun PermissionError