tests: Don't skip SIGINT test

Author: ashleyhindle

tests/Unit/ServerTest.php

@@ -72,7 +72,7 @@
     posix_kill($pid, SIGINT);
     proc_terminate($this->process, SIGINT);
     expect($pid)->toNotBeRunning(2500);
-})->skip(inGithubActions(), 'Not working on GitHub CI atm, but works wonderfully locally and on test servers');
+});
 
 test('handles SIGTERM interrupt gracefully', function () {
     ['process' => $this->process, 'pid' => $pid] = start_server_and_wait_for_listening($this->serverScript, $this->host, $this->port);