Check if Py311 is the source of compiler crashes

.github/workflows/pythonpackage.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ['3.8', '3.9', '3.10', '3.11']
+        python-version: ['3.8', '3.9', '3.10', ]
     steps:
     - uses: actions/checkout@v3
     - name: Set up Python ${{ matrix.python-version }}
@@ -22,6 +22,7 @@ jobs:
       run: |
         pip install --upgrade pip setuptools wheel
         pip install coverage pytest pytest-cov -U
+        pip install Cython
         pip install --only-binary=numpy,scipy numpy scipy -U
         pip install .
     - name: Test with pytest