Issue #3038892 by alexpott, quietone:...

Issue #3038892 by alexpott, quietone: Drupal\Tests\migrate_drupal\Kernel\d6\FieldDiscoveryTest randomly fails on PostgreSQL

(cherry picked from commit 6896b4eb)

core/modules/field/src/Plugin/migrate/source/d6/FieldInstance.php

@@ -25,6 +25,8 @@ public function query() {
     }
     $query->join('content_node_field', 'cnf', 'cnf.field_name = cnfi.field_name');
     $query->fields('cnf');
+    $query->orderBy('cnfi.field_name');
+    $query->orderBy('cnfi.type_name');
 
     return $query;
   }