Replace logrus with log/slog

[scop]

Large but low complexity PR, replaces logrus with the stdlib log/slog package.

Benefits of this include

• One 3rd party dependency fewer
• Slightly smaller binary
• go vet (included in golangci-lint) helps flag errors

The log format produced is different, matter of taste which looks nicer, but I think users are not exposed to it much at all anyway in normal circumstances.

[sairon]

Looks good!

Needless to say, the reduction of binary size is negligible (~30kB) but having one dependency less is nice anyway. There are some minor nuances, like missing trace level which is now silently ignored and logging falls back to WARN, but I don't see it as a big deal, as we haven't used it explicitly and likely no one will even notice.

Thank you!

[sairon]

Looks good!

Needless to say, the reduction of binary size is negligible (~30kB) but having one dependency less is nice anyway. There are some minor nuances, like missing trace level which is now silently ignored and logging falls back to WARN, but I don't see it as a big deal, as we haven't used it explicitly and likely no one will even notice.

Thank you!