fix: remove override when override not needed

Author: Amnesthesia

lib/rails_semantic_logger/extensions/active_support/logger.rb

@@ -20,10 +20,6 @@ def self.logger_outputs_to?(*args)
       true
     end
 
-    def self.broadcast(logger)
-      Module.new
-    end
-
     def self.new(*args, **kwargs)
       SemanticLogger[self]
     end