utf8.php should be updated (php8.2)

This has been discussed in the past but the solution is usually to ask plugin authors ton update their plugins for improved PHP8.1/PHP8.2 compatibility, whereas I think this is clearly a problem inside Xenforo 2.2 codebase, up and including 2.2.15

The file
./src/vendor/dokuwiki/utf8/utf8.php

Contains code that is not compatible with PHP8.2, often spitting out warning/deprecations about passing "null" to strlen

Template XXXXXXXXXX: [E_DEPRECATED] mb_convert_encoding(): Passing null to parameter...

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