Fix autobuild of docs

Author: LeanderCS

.github/workflows/deploy-docs.yaml

@@ -20,10 +20,10 @@ jobs:
 
       - uses: actions/setup-python@v4
         with:
-          python-version: '3.x'
+          python-version: 3.11
 
       - name: Install Dependencies
-        run: pip install sphinx sphinx_rtd_theme sphinx_design
+        run: pip install sphinx sphinx_rtd_theme sphinx_design cython
 
       - name: Build Documentation
         run: sphinx-build -b html docs/source/ _build