fix: release renderer to fix crashes on android.

lib/src/voip/call.dart

@@ -89,6 +89,12 @@ class WrappedMediaStream {
       await stream?.dispose();
       stream = null;
     }
+    await renderer.dispose();
+  }
+
+  Future<void> disposeRenderer() async {
+    renderer.srcObject = null;
+    await renderer.dispose();
   }
 
   Uri? get avatarUrl => getUser().avatarUrl;

lib/src/voip/group_call.dart

@@ -1095,7 +1095,9 @@ class GroupCall {
     stream.stream!.getTracks().forEach((element) {
       element.stop();
     });
+
     stream.stream!.dispose();
+    stream.disposeRenderer();
 
     onGroupCallEvent.add(GroupCallEvent.UserMediaStreamsChanged);