rack_graphql.rb in rack-graphql-3.7.0

- old
+ new

@@ -1,5 +1,5 @@
-require 'oj'
+require 'json'
 require 'rack'
 require 'graphql'
 
 # Timeout needs to be manually required before following fix is released:
 # https://github.com/rmosolgo/graphql-ruby/commit/56abba472dbb48a1f8445d41f928bea72b5148e9