Remove deprecation warning

lib/graphql/railtie.rb

@@ -3,17 +3,7 @@
 module GraphQL
   class Railtie < Rails::Railtie
     config.graphql = ActiveSupport::OrderedOptions.new
-    config.graphql.parser_cache = nil
-
-    config.before_initialize do
-      if config.graphql.parser_cache.nil? && ::Object.const_defined?("Bootsnap::CompileCache::ISeq") && Bootsnap::CompileCache::ISeq.cache_dir
-        Deprecation.warn <<~MSG.squish
-          The GraphQL parser cache must be explicitly enabled in your application.
-          Please add `config.graphql.parser_cache = true` to your application config.
-        MSG
-        config.graphql.parser_cache = true
-      end
-    end
+    config.graphql.parser_cache = false
 
     initializer("graphql.cache") do |app|
       if config.graphql.parser_cache