Build lxml with Cython on windows-latest with python 3.10

Author: pdecat

.github/workflows/build.yml

@@ -58,7 +58,7 @@ jobs:
           poetry config virtualenvs.in-project true # Easier to locate virtualenv
           python -m venv .venv
           .venv/Scripts/pip.exe install Cython --install-option="--no-cython-compile"
-          .venv/Scripts/pip.exe install lxml -vvv
+          .venv/Scripts/pip.exe install lxml --install-option="--with-cython" -vvv
         if: matrix.os == 'windows-latest' && matrix.python-version == '3.10-dev'
 
       - name: Install aws-adfs and its dependencies