Remove deprecation message from Action Pack

Related to the deprecation of Time.utc_time in favor of Time.utc,
in 48583f8.

actionpack/lib/action_view/helpers/tags/date_select.rb

@@ -58,7 +58,7 @@ def default_datetime(options)
               default[key] ||= time.send(key)
             end
 
-            Time.utc_time(
+            Time.utc(
               default[:year], default[:month], default[:day],
               default[:hour], default[:min], default[:sec]
             )