test(db): add DB dependency to migration class

Signed-off-by: Josh <josh.t.richards@gmail.com>

Author: joshtrichards

tests/lib/DB/MigrationServiceTest.php

@@ -34,6 +34,7 @@
  *
  * @package Test\DB
  */
+#[Group('DB')]
 class MigrationServiceTest extends \Test\TestCase {
 	private Connection&MockObject $db;