UnusedUseStatement sniff must not be case sensitive

Problem/Motivation

phpcs --standard=Drupal modules/user/src/EventSubscriber/AccessDeniedSubscriber.php

FILE: ...core/modules/user/src/EventSubscriber/AccessDeniedSubscriber.php
----------------------------------------------------------------------
FOUND 2 ERRORS AND 1 WARNING AFFECTING 3 LINES
----------------------------------------------------------------------
  3 | ERROR   | [x] Namespaced classes, interfaces and traits should
    |         |     not begin with a file doc comment
 13 | WARNING | [x] Unused use statement
 46 | ERROR   | [ ] Expected type hint "UrlGeneratorInterface"; found
    |         |     "URLGeneratorInterface" for $url_generator

This is because the use statement is:

use Drupal\Core\Routing\UrlGeneratorInterface;

and the code is:

  public function __construct(AccountInterface $account, URLGeneratorInterface $url_generator) {

The problem is UrlGeneratorInterface vs URLGeneratorInterface. So either the fix here is wrong - it is removes the use statement - or the sniff is wrong. I think the sniff is wrong because PHP is not case sensitive.

Proposed resolution

tbd

Remaining tasks

User interface changes

None

API changes

None

Data model changes

None