Update actions versions, enable Python 3.12

.github/workflows/run-pytest.yml

@@ -20,20 +20,20 @@ jobs:
           - '3.9'
           - '3.10'
           - '3.11'
-          #- '3.12'
+          - '3.12'
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
 
     - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v2
+      uses: actions/setup-python@v5
       with:
         python-version: ${{ matrix.python-version }}
 
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip wheel
-        python -m pip install -r requirements_dev.txt
+        python -m pip install pytest
     
     - name: Test with pytest
       env: