[skip ci] Mark another openssl test as xfail

Author: iluuu1994

ext/openssl/tests/openssl_error_string_basic.phpt

@@ -6,6 +6,7 @@ openssl
 <?php
 if (OPENSSL_VERSION_NUMBER >= 0x30000000) die('skip For OpenSSL < 3.0');
 ?>
+--XFAIL--
 --FILE--
 <?php
 // helper function to check openssl errors