fix apigen dependencies

Author: stevehenty

composer.json

@@ -16,7 +16,7 @@
 		"issues": "https://gravityflow.io"
     },
     "require-dev": {
-      "apigen/apigen": "~4.0",
+      "apigen/apigen": "~4.1.2",
       "lucatume/wp-browser": "1.19.12",
       "codeception/codeception": "2.2.12"
     }