Use the latest transaction modification time fore the hash

scripts/bake/bake.php

@@ -240,7 +240,7 @@ function GetRevisionHash($revision) {
   $xaction = id(new DifferentialTransactionQuery())
     ->setViewer($viewer)
     ->withObjectPHIDs(array($revision->getPHID()))
-    ->setOrder('newest')
+    ->setOrder('updated')
     ->setLimit(1)
     ->executeOne();
 
@@ -405,7 +405,7 @@ function GetTaskHash($task) {
   $xaction = id(new ManiphestTransactionQuery())
     ->setViewer($viewer)
     ->withObjectPHIDs(array($task->getPHID()))
-    ->setOrder('newest')
+    ->setOrder('updated')
     ->setLimit(1)
     ->executeOne();