devel/rubygem-graphql: update to 2.4.11

This fixes messages displayed while starting gitlab like:
Failed to define value method for :description, because Types::IssuableSearchableFieldEnum already responds to that method. Use value_method: to override the method name or value_method: false to disable Enum value method generation.

Changes: https://github.com/rmosolgo/graphql-ruby/blob/master/CHANGELOG.md
PR: 284699