do not override checkout adapter

lib/que/adapters/active_record_with_lock.rb

@@ -9,22 +9,10 @@ def initialize(job_connection_pool:, lock_connection_pool:)
         super
       end
 
-      def checkout
+      def checkout_activerecord_adapter(&block)
         checkout_lock_database_connection do
-          checkout_activerecord_adapter { |conn| yield conn.raw_connection }
+          @job_connection_pool.with_connection(&block)
         end
-      rescue *AR_UNAVAILABLE_CONNECTION_ERRORS => e
-        raise UnavailableConnection, e
-      rescue ::ActiveRecord::StatementInvalid => e
-        raise e unless AR_UNAVAILABLE_CONNECTION_ERRORS.include?(e.cause.class)
-
-        # ActiveRecord::StatementInvalid is one of the most generic exceptions AR can
-        # raise, so we catch it and only handle the specific nested exceptions.
-        raise UnavailableConnection, e.cause
-      end
-
-      def checkout_activerecord_adapter(&block)
-        @job_connection_pool.with_connection(&block)
       end
 
       def checkout_lock_database_connection(&block)