[chore] Silence maxprocs logging (#1402)

This switches the logger to Debug. By default the library logs things
internally despite returning errors. Due to the way we had it hooked up
this resulted in scary error level logs being emitted for innocuous
errors. Now those errors will only be visible in debug mode.

Fixes: #1398
Relates to: #1336

cmd/gotosocial/action/server/server.go

@@ -62,7 +62,7 @@ import (
 
 // Start creates and starts a gotosocial server
 var Start action.GTSAction = func(ctx context.Context) error {
-	_, err := maxprocs.Set(maxprocs.Logger(log.Errorf))
+	_, err := maxprocs.Set(maxprocs.Logger(log.Debugf))
 	if err != nil {
 		return fmt.Errorf("failed to set CPU limits from cgroup: %s", err)
 	}