deps: upgrade deno and ffmpeg (#29)

Author: arnoldhao

backend/consts/mirrors.go

@@ -282,9 +282,9 @@ func GetDenoAPIURL() (string, error) {
 // Dependencies Embedded Versions
 const (
 	EMBEDDED_YTDLP_VERSION          = "2025.12.08"
-	EMBEDDED_FFMPEG_VERSION_DARWIN  = "121793-g1eb2cbd865"
-	EMBEDDED_FFMPEG_VERSION_WINDOWS = "7.1.2-4"
-	EMBEDDED_DENO_VERSION           = "v2.5.6"
+	EMBEDDED_FFMPEG_VERSION_DARWIN  = "122084-gf8929c4510"
+	EMBEDDED_FFMPEG_VERSION_WINDOWS = "7.1.3-1"
+	EMBEDDED_DENO_VERSION           = "v2.6.0"
 
 	// YTDLP_EJS_MIN_VERSION 定义支持 EJS 的 yt-dlp 最低版本
 	YTDLP_EJS_MIN_VERSION = "2025.11.22"