LengthValidator should use mb_strlen instead of strlen

[kesselb]

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Code:

password_policy/lib/Validator/LengthValidator.php

Line 26 in 04ed148

if (strlen($password) < $minLength) {

Sample:

<?php

$a = '12345';
$b = '密码密码';

var_dump(
    strlen($a),
    strlen($b),
    mb_strlen($a), 
    mb_strlen($b),
);

Output:

int(5)
int(12)
int(5)
int(4)