fix FormData headers for voice recording uploads

discord/util.ts

@@ -344,7 +344,10 @@ async function requestRVCResponse(src: Attachment, pitch?: number): Promise<Node
     logInfo(`[bot] Got audio file: ${srcbuf.byteLength} bytes`);
 
     const fd = new FormData();
-    fd.append('input_audio', readFileSync(tmpFileName), 'voice-message.ogg');
+    fd.append('input_audio', readFileSync(tmpFileName), {
+        filename: 'voice-message.ogg',
+        contentType: 'audio/ogg',
+    });
     fd.append('modelpath', 'model.pth');
     fd.append('f0_up_key', pitch ?? 0);
 
@@ -352,6 +355,7 @@ async function requestRVCResponse(src: Attachment, pitch?: number): Promise<Node
     logInfo(`[bot] Requesting RVC response for ${src.id}`);
     const res = await fetch(rvcEndpoint, {
         method: 'POST',
+        headers: fd.getHeaders(),
         body: fd,
     });
     const resContents = await res.blob();