OZG-6867 Remove unused field

src/test/java/de/ozgcloud/admin/organisationseinheit/SyncServiceTest.java

@@ -484,7 +484,6 @@ class SyncServiceTest {
 
 		private final long syncTimestamp = Instant.now().toEpochMilli();
 		private final String addedGroupId = UUID.randomUUID().toString();
-		private final String parentKeycloakId = UUID.randomUUID().toString();
 		private final OrganisationsEinheit organisationsEinheit = OrganisationsEinheitTestFactory.create();
 
 		@Test