Fix github hook for json validation, python2 deprecated as hell

.github/workflows/main.yml

@@ -9,10 +9,10 @@ jobs:
 
     steps:
     - uses: actions/checkout@v2
-    - name: Set up Python 2.7
-      uses: actions/setup-python@v2
+    - name: Set up Python 3
+      uses: actions/setup-python@v4
       with:
-        python-version: 2.7
+          python-version: '3.10' 
     - name: Check apps.json
       run: |
         python -m json.tool apps.json