test: cover optional revocation timestamp argument

Signed-off-by: Vitor Mattos <[email protected]>

Author: vitormattos

tests/php/Unit/Service/Crl/CrlServiceTest.php

@@ -282,7 +282,8 @@ public function testRevokeCertificateWithValidReasonCode(): void {
 				$reasonText,
 				$revokedBy,
 				null,
-				5
+				5,
+				null,
 			);
 
 		$result = $this->service->revokeCertificate($serialNumber, $reason, $reasonText, $revokedBy);