ci(test): Update MODULE.json with PHPStan level 1

Author: jissereitsma

MODULE.json

@@ -24,7 +24,7 @@
         "integration": 3,
         "functional": 0
     },
-    "phpcs_severity": "8",
+    "phpcs_severity": "7",
     "phpstan_level": "1",
     "module_name": "Loki_Base",
     "composer_name": "loki/magento2-base",