fix(validation): use mb_strlen in IsPassword for Unicode support

Author: xHeaven

packages/validation/src/Rules/IsPassword.php

@@ -32,7 +32,7 @@ public function isValid(mixed $value): bool
             return false;
         }
 
-        if (strlen($value) < $this->min) {
+        if (mb_strlen($value) < $this->min) {
             return false;
         }