fix expectation

Author: medilies

tests/Dompurify/DompurifyServiceTest.php

@@ -70,7 +70,5 @@
     ));
 
     expect(fn () => $service->start())->toThrow(ProcessFailedException::class);
-    expect($service->serviceProcess->getTermSignal())->toBe(127);
-    // TODO: fix https://github.com/medilies/xssless/actions/runs/10283025153/job/28455979969
-    // TODO: wait for signal
+    expect($service->serviceProcess->getExitCode())->toBe(127);
 });