Fix CS/WS issue

Author: sebastianbergmann

tests/end-to-end/regression/6105/IssueTest6105.php

@@ -12,6 +12,7 @@
 use function header;
 use function ob_get_clean;
 use function ob_start;
+use function xdebug_get_headers;
 use PHPUnit\Framework\Attributes\CoversNothing;
 use PHPUnit\Framework\Attributes\RequiresPhpExtension;
 use PHPUnit\Framework\Attributes\RunInSeparateProcess;