`ILogger` is deprecated and will be removed

[susnux]

The ILogger interface is deprecated and its logging functions will be removed with Nextcloud 31. Please migrate to the PSR LoggerInterface. The logging levels inside ILogger will remain, but we recommend to use the logging levels provided by PSR-3.

Code reference: https://github.com/nextcloud/fulltextsearch/blob/ed5d1916bbe398b21379a3f717499a1b278c2ada/lib/Service/MiscService.php#L45

[susnux]

cc @come-nc @ArtificialOwl

[MrRinkana]

Isn't this closed by #875?

[come-nc]

Yes it is. Thanks for noticing.