roll back to python3.8

Author: mspruc

.github/workflows/backend.yml

@@ -50,7 +50,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v5
         with:
-          python-version: '3.11'
+          python-version: '3.8.10'
           cache: 'pip'
       - name: Install Python dependencies
         run: |

python/src/pywy/requirements.txt

@@ -16,5 +16,5 @@
 #
 
 # we support python 3.11
-numpy==2.3.0
+numpy==1.24.4
 cloudpickle==3.1.2