chore(dev): phpstan: replace deprecated `checkGenericClassInNonGeneri…

…cObjectType` with `identifier: missingType.generics`

Due to this message from phpstan:
```
⚠️  You're using a deprecated config option checkGenericClassInNonGenericObjectType ⚠️️

It's strongly recommended to remove it from your configuration file
and add the missing generic typehints.

If you want to continue ignoring missing typehints from generics,
add missingType.generics error identifier to your ignoreErrors:

parameters:
        ignoreErrors:
                -
                        identifier: missingType.generics
```

phpstan.neon.dist

@@ -14,8 +14,9 @@ parameters:
     inferPrivatePropertyTypeFromConstructor: true
     checkUninitializedProperties: true
     checkModelProperties: true
-    checkGenericClassInNonGenericObjectType: false
     ignoreErrors:
+        -
+          identifier: missingType.generics
         - '/Call to an undefined method Illuminate\\Testing\\TestResponse::(content|getData|getStatusCode)\(\)/'
         # tests/Unit/GraphQLTest.php
         - '/Call to an undefined method GraphQL\\Type\\Definition\\Type::getFields\(\)/'