Closes #2521 - Fix code smells Stream.collect(Collectors.toList()) to Stream.toList()

lib/taskana-core/src/main/java/pro/taskana/user/internal/UserServiceImpl.java

@@ -89,7 +89,7 @@ public class UserServiceImpl implements UserService {
 
     users.forEach(user -> user.setDomains(determineDomains(user)));
 
-    return users.stream().map(User.class::cast).collect(Collectors.toList());
+    return users.stream().map(User.class::cast).toList();
   }
 
   @Override