demirel yes, there shouldn't be any issue. It's just that one of the dependencies told Composer it has only been tested with PHP 8.0 and 8.1, so Composer freaks out when it realizes you are on PHP 8.2. But PHP versions are for the most part backward compatible so there are probably no actual runtime errors.
To make Composer ignore the problem you have to use one of the command flags that tell it to ignore the version, or edit composer.json and tell it you want the version of Flarum's dependencies for PHP 8.1, which will most likely work in 8.2 as well.
