PHP 8.1 deprecation notice #473
Description
Running this library on PHP 8.1 results in this deprecation notice:
Deprecated: Return type of Embed\EmbedCode::jsonSerialize() should either be compatible with JsonSerializable::jsonSerialize(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in vendor/embed/embed/src/EmbedCode.php on line 31
Fixing this will make the library less noisy.