all: apply modernisers

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/outcome/finalise.go

@@ -58,8 +58,7 @@ func (k *outcome) finalise(
 	supp := make([]string, len(config.Groups))
 	for i, name := range config.Groups {
 		if gid, err := k.lookupGroupId(name); err != nil {
-			var unknownGroupError user.UnknownGroupError
-			if errors.As(err, &unknownGroupError) {
+			if unknownGroupError, ok := errors.AsType[user.UnknownGroupError](err); ok {
 				return newWithMessageError(fmt.Sprintf("unknown group %q", name), unknownGroupError)
 			} else {
 				return &hst.AppError{Step: "look up group by name", Err: err, Msg: err.Error()}