tox: upgrade setup-python@v5, checkout@v4, lint, pip cache

Signed-off-by: Teo <[email protected]>

.github/workflows/python-testing.yml

@@ -25,15 +25,15 @@ jobs:
 
     strategy:
       matrix:
-        python-version: [3.7,3.8,3.9,3.10,3.11,3.12]
+        python-version: ["3.7","3.8","3.9","3.10","3.11","3.12"]
 
     steps:
-      - uses: actions/checkout@v2
-      - name: Set up Python
-        uses: actions/setup-python@v2
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
         with:
+          cache: 'pip'
           python-version: '3.11' # Use a default Python version for running tox
       - name: Install tox
         run: pip install tox
       - name: Run tests with tox
-        run: tox
+        run: tox