MetadataAwareNameConverter fixd in symfony 4.2.6

bump for lower

Author: soyuka

composer.json

@@ -21,7 +21,7 @@
         "symfony/http-kernel": "^3.4 || ^4.0",
         "symfony/property-access": "^3.4 || ^4.0",
         "symfony/property-info": "^3.4 || ^4.0",
-        "symfony/serializer": "^4.2",
+        "symfony/serializer": "^4.2.6",
         "symfony/web-link": "^4.1",
         "willdurand/negotiation": "^2.0.3"
     },