fix: fixed pin tests

packages/stream_chat/lib/src/api/channel.dart

@@ -411,7 +411,8 @@ class Channel {
   /// Waits for a [_messageAttachmentsUploadCompleter] to complete
   /// before actually updating the message.
   Future<UpdateMessageResponse> updateMessage(Message message) async {
-    var currentMessage = state?.messages.firstWhere((e) => e.id == message.id);
+    final currentMessage =
+        state?.messages.firstWhere((e) => e.id == message.id);
 
     // Cancelling previous completer in case it's called again in the process
     // Eg. Updating the message while the previous call is in progress.

packages/stream_chat/lib/src/client.dart

@@ -1353,7 +1353,7 @@ class StreamChatClient {
   Future<UpdateMessageResponse> partiallyUpdateMessage(
       String id, Map data) async {
     final response = await put(
-      '/messages/${id}',
+      '/messages/$id',
       data: data,
     );
     return decode(response.data, UpdateMessageResponse.fromJson);