PHP 8.2: Function utf8_encode() is deprecated in AuthenticationService

[mfvetter]

Hello, thanks for this amazing extension!

I'm testing TYPO3 11 in PHP 8.2 and when I try to login on the Frontend via SSO + this extension I'm getting this error:

#1476107295 TYPO3\CMS\Core\Error\Exception

PHP Runtime Deprecation Notice: Function utf8_encode() is deprecated in /public/typo3conf/ext/ig_ldap_sso_auth/Classes/Service/AuthenticationService.php line 278

PHP 8.1 works well.

Thanks!