refactor: remove unused stderr variable from ffprobe output capture

src/main.ts

@@ -22,7 +22,7 @@ function analyzeVideo(videoFile: string): VideoInfo {
     videoFile,
   ];
   const process = new Deno.Command(cmd, { args });
-  const { stdout, stderr } = process.outputSync();
+  const { stdout } = process.outputSync();
   const videoInfo = JSON.parse(new TextDecoder().decode(stdout));
   return videoInfo;
 }