Use #load_schema instead instead of #load_schema_for

Rails 5.1 removed the deprecated method #load_schema_for in favor
of #load_schema.

ee/lib/gitlab/geo/database_tasks.rb

@@ -128,7 +128,7 @@ module Gitlab
           Gitlab::Geo::DatabaseTasks.with_geo_db do
             should_reconnect = ActiveRecord::Base.connection_pool.active_connection?
             ActiveRecord::Schema.verbose = false
-            ActiveRecord::Tasks::DatabaseTasks.load_schema_for ActiveRecord::Base.configurations['test'], :ruby, ENV['SCHEMA']
+            ActiveRecord::Tasks::DatabaseTasks.load_schema ActiveRecord::Base.configurations['test'], :ruby, ENV['SCHEMA']
           ensure
             if should_reconnect
               ActiveRecord::Base.establish_connection(ActiveRecord::Base.configurations[ActiveRecord::Tasks::DatabaseTasks.env])