Lower respawn for Empty Cauldron and Iron Chain (#4427)

data/sql/updates/pending_db_world/rev_1612360387230427830.sql

@@ -0,0 +1,9 @@
+INSERT INTO `version_db_world` (`sql_rev`) VALUES ('1612360387230427830');
+
+-- Fix DK quest: The Plaguebringer's Request
+
+UPDATE `gameobject` SET `spawntimesecs`=2 WHERE `guid` IN
+(
+66377,  -- Empty Cauldron
+66378   -- Iron Chain
+);