Align IDL type of RTCEncodedVideoFrameMetadata.dependencies with RTCEncodedVideoFrameMetadata.frameId

per #126

Author: dontcallmedom

index.bs

@@ -275,7 +275,7 @@ enum RTCEncodedVideoFrameType {
 
 dictionary RTCEncodedVideoFrameMetadata {
     unsigned long long frameId;
-    sequence<long long> dependencies;
+    sequence<unsigned long long> dependencies;
     unsigned short width;
     unsigned short height;
     unsigned long spatialIndex;