vscode configuration: Fixed path to python3 executable for syntax check

.vscode/settings.json

@@ -14,5 +14,6 @@
     },
     "files.exclude": {
         "playbooks/{credentials,group_vars,helpers,host_vars,public_keys,roles}/": true
-    }
+    },
+    "python.pythonPath": "/usr/bin/python3"
 }