update workflow testing multiple python versions

.github/workflows/pytests.yml

@@ -14,16 +14,23 @@ jobs:
 
     runs-on: ubuntu-20.04 # specifically calls the version number instead of lastest to work on 'act'
 
+    strategy:
+      matrix:
+        os: ["ubuntu-latest"]
+        python-version: ['3.9', '3.10', '3.11', 3.12']
+
+    name: Python (${{ matrix.python-version }} on ${{ matrix.os }})
     steps:
     - uses: actions/checkout@v3
-    - name: Set up Python 3.9
+    - name: Set up Python
       uses: actions/setup-python@v3
       with:
-        python-version: '3.9'
+        python-version: ${{ matrix.python-version }}
+
     - name: Install dependencies
       run: |
         export SKLEARN_ALLOW_DEPRECATED_SKLEARN_PACKAGE_INSTALL=True
         pip install -r requirements.txt
     - name: Test with pytest
       run: |
-        python3 -m pytest
+        python -m pytest