Fix Style/RedundantFileExtensionInRequire cop

This cop identifies and recommends removing redundant '.rb' file extensions
specified in require and require_relative statements. Omitting the extension
improves code clarity and adheres to Ruby's behavior.
https://docs.rubocop.org/rubocop/cops_style.html#styleredundantfileextensioninrequire

config/initializers/ldap_instrumentation.rb

@@ -1,6 +1,6 @@
-require 'foreman/ldap/ldap_subscriber.rb'
-require 'foreman/ldap/ldap_fluff_subscriber.rb'
-require 'foreman/ldap/net_ldap_subscriber.rb'
+require 'foreman/ldap/ldap_subscriber'
+require 'foreman/ldap/ldap_fluff_subscriber'
+require 'foreman/ldap/net_ldap_subscriber'
 
 # Debug logging from net-ldap and ldap_fluff events sent via ActiveSupport::Notifications
 Rails.application.config.after_initialize do