Exclude issue update mutation from ID_TYPE rubocop check

We cannot just change the type on the milestone_id as it is being used
and the type change is not backward compatible in this case.

.rubocop_manual_todo.yml

@@ -26,7 +26,6 @@ Graphql/IDType:
     - 'ee/app/graphql/mutations/iterations/update.rb'
     - 'ee/app/graphql/resolvers/iterations_resolver.rb'
     - 'app/graphql/mutations/boards/issues/issue_move_list.rb'
-    - 'app/graphql/mutations/issues/update.rb'
     - 'app/graphql/mutations/metrics/dashboard/annotations/delete.rb'
     - 'app/graphql/resolvers/design_management/design_at_version_resolver.rb'
     - 'app/graphql/resolvers/design_management/design_resolver.rb'

app/graphql/mutations/issues/update.rb

@@ -11,7 +11,7 @@ module Mutations
                required: false,
                description: copy_field_description(Types::IssueType, :title)
 
-      argument :milestone_id, GraphQL::ID_TYPE,
+      argument :milestone_id, GraphQL::ID_TYPE, # rubocop: disable Graphql/IDType
                required: false,
                description: 'The ID of the milestone to assign to the issue. On update milestone will be removed if set to null'