remove useless dependencies

packages/stream_chat_flutter/pubspec.yaml

@@ -30,16 +30,13 @@ dependencies:
   flutter_keyboard_visibility: ^4.0.2
   video_compress: ^2.1.1
   visibility_detector: ^0.1.5
-  http_parser: ^3.1.4
   meta: ^1.2.4
   lottie: ^0.7.0+1
   substring_highlight: ^0.1.2
   flutter_slidable: ^0.5.7
-  clipboard: ^0.1.2+8
   image_gallery_saver: ^1.6.7
   share_plus: ^1.2.0
   photo_manager: ^1.0.0
-  transparent_image: ^1.0.0
   ezanimation: ^0.4.1
   synchronized: ^2.1.0
   characters: ^1.0.0