ISSUE-4798: Memory leaks in TestSuite class

 - remove unused imports

Author: kandy

src/Framework/TestSuite.php

@@ -10,7 +10,6 @@
 namespace PHPUnit\Framework;
 
 use const PHP_EOL;
-use function array_diff;
 use function array_keys;
 use function array_merge;
 use function basename;