fix(tests): add missing farp import in farp_adapter_test.go

Author: juicycleff

extensions/discovery/farp_adapter_test.go

@@ -4,6 +4,7 @@ import (
 	"testing"
 	"time"
 
+	"github.com/xraph/farp"
 	"github.com/xraph/forge"
 )