php 8.1 compatibility

[linuxd3v]

Currently encountering fatal errors while using with php 8.1:

ERROR php_swoole_server_rshutdown() (ERRNO 503): Fatal error: During inheritance of IteratorAggregate: Uncaught ErrorException: Return type of Essence\Media::getIterator() should either be compatible with IteratorAggregate::getIterator(): Traversable, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /var/www/site/vendor/essence/essence/lib/Essence/Media.php:259

ERROR php_swoole_server_rshutdown() (ERRNO 503): Fatal error: During inheritance of JsonSerializable: Uncaught ErrorException: Return type of Essence\Media::jsonSerialize() should either be compatible with JsonSerializable::jsonSerialize(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /var/www/site/vendor/essence/essence/lib/Essence/Media.php:271

[felixgirault]

Hello,
Sorry I do not have much time these days to work on essence, would you be ok to submit a pull request ?