Install cython

Author: pbchekin

.github/workflows/build-test-windows.yml

@@ -30,6 +30,6 @@ jobs:
       - name: Build Triton
         run: |
           cd python
-          pip install -U wheel pybind11 certifi
+          pip install -U wheel pybind11 certifi cython
           python -m certifi
           pip install --no-build-isolation '.[build,tests,tutorials]'