Remove incorrect inheritance

spec/support/gitlab_experiment.rb

@@ -5,7 +5,7 @@ require 'gitlab/experiment/rspec'
 
 # This is a temporary fix until we have a larger discussion around the
 # challenges raised in https://gitlab.com/gitlab-org/gitlab/-/issues/300104
-class ApplicationExperiment < Gitlab::Experiment # rubocop:disable Gitlab/NamespacedClass
+class ApplicationExperiment # rubocop:disable Gitlab/NamespacedClass
   def initialize(...)
     super(...)
     Feature.persist_used!(feature_flag_name)