Merge branch 'sh-remove-trailing-comma' into 'master'

Remove trailing comma in dependency linker to satisfy Rubocop

See merge request !11348

lib/gitlab/dependency_linker.rb

 module Gitlab
   module DependencyLinker
     LINKERS = [
-      GemfileLinker,
+      GemfileLinker
     ].freeze
     def self.linker(blob_name)