test: fix test.

Signed-off-by: xsahil03x <[email protected]>

packages/stream_chat/test/fixtures/message_to_json.json

@@ -5,7 +5,7 @@
   "silent": false,
   "attachments": [
     {
-      "type": "video",
+      "type": "giphy",
       "title_link": "https://media.giphy.com/media/5zvN79uTGfLMOVfQaA/giphy.gif",
       "title": "The Lion King Disney GIF - Find & Share on GIPHY",
       "thumb_url": "https://media.giphy.com/media/5zvN79uTGfLMOVfQaA/giphy.gif",

packages/stream_chat/test/src/core/models/message_test.dart

@@ -38,7 +38,7 @@ void main() {
             'https://giphy.com/gifs/the-lion-king-live-action-5zvN79uTGfLMOVfQaA',
         attachments: [
           Attachment.fromJson(const {
-            'type': 'video',
+            'type': 'giphy',
             'author_name': 'GIPHY',
             'title': 'The Lion King Disney GIF - Find \u0026 Share on GIPHY',
             'title_link':