Added specific Cython version when compiling older Python 3.8

.github/workflows/github-actions.yml

@@ -24,7 +24,7 @@ jobs:
         run: python -m pip install --upgrade pip
         shell: bash
       - name: Generate Minimum Requirements File
-        run: sed 's/>/=/g' requirements.txt | sed 's/$/\.*/g' > requirements.min.txt
+        run: sed 's/>/=/g' requirements.txt | sed 's/$/\.*/g' | cat - <(echo "cython==0.29") > requirements.min.txt
         shell: bash
       - name: Install Minimum Requirements
         run: python -m pip install --upgrade -r requirements.min.txt