Fix a PHP 8.1 issue with "phutil_console_strlen()"

Summary: Ref T13588.

Test Plan: Ran unit tests in D21757.

Maniphest Tasks: T13588

Differential Revision: https://secure.phabricator.com/D21758

src/utils/utf8.php

@@ -314,6 +314,8 @@ function phutil_utf8_strlen($string) {
  * @return  int     The console display length of the string.
  */
 function phutil_utf8_console_strlen($string) {
+  $string = phutil_string_cast($string);
+
   // Formatting and colors don't contribute any width in the console.
   $string = preg_replace("/\x1B\[\d*m/", '', $string);