add new youtubedl dependency

downloader/vendor/github.com/kkdai/youtube/v2/logger.go

@@ -0,0 +1,28 @@
+package youtube
+
+import (
+	"fmt"
+	"log/slog"
+	"os"
+)
+
+// The global logger for all Client instances
+var Logger = getLogger(os.Getenv("LOGLEVEL"))
+
+func SetLogLevel(value string) {
+	Logger = getLogger(value)
+}
+
+func getLogger(logLevel string) *slog.Logger {
+	levelVar := slog.LevelVar{}
+
+	if logLevel != "" {
+		if err := levelVar.UnmarshalText([]byte(logLevel)); err != nil {
+			panic(fmt.Sprintf("Invalid log level %s: %v", logLevel, err))
+		}
+	}
+
+	return slog.New(slog.NewTextHandler(os.Stderr, &slog.HandlerOptions{
+		Level: levelVar.Level(),
+	}))
+}