Compatibilité PHP 8.2

Notons ce deprecated de utf8_encode

• https://php.watch/versions/8.2/utf8_encode-utf8_decode-deprecated

En usage dans

• inc/surligne https://git.spip.net/spip/spip/src/branch/master/ecrire/inc/surligne.php#L65
• & html purifier 1.14 https://github.com/ezyang/htmlpurifier/issues/320