Move JSON validation script to CI folder

.github/workflows/github.yml

@@ -151,7 +151,7 @@ jobs:
       if: ${{ startsWith(matrix.preset, 'linux-clang-test') }}
       run: |
         pip3 install json5 jstyleson
-        python3 .github/validate_json.py
+        python3 CI/linux-qt6/validate_json.py
 
     - name: Dependencies
       run: source '${{github.workspace}}/CI/${{matrix.platform}}/before_install.sh'