Fix type rubocop on merge_requests_resolver.rb

.rubocop_manual_todo.yml

@@ -37,7 +37,6 @@ Graphql/ResolverType:
     - 'app/graphql/resolvers/base_resolver.rb'
     - 'app/graphql/resolvers/ci/jobs_resolver.rb'
     - 'app/graphql/resolvers/ci/pipeline_stages_resolver.rb'
-    - 'app/graphql/resolvers/merge_requests_resolver.rb'
     - 'app/graphql/resolvers/users/group_count_resolver.rb'
     - 'ee/app/graphql/resolvers/vulnerabilities_base_resolver.rb'
 

app/graphql/resolvers/merge_requests_resolver.rb

@@ -4,6 +4,8 @@ module Resolvers
   class MergeRequestsResolver < BaseResolver
     include ResolvesMergeRequests
 
+    type ::Types::MergeRequestType.connection_type, null: true
+
     alias_method :project, :synchronized_object
 
     def self.accept_assignee