Upgrade web_socket_channel dependency. (#6153)
Upgrade web_socket_channel dependency. (#6153)

Turns out the lowest version allowed here isn't compatible with
flutter_tools' usage of this package.
flutter/flutter,flutter/flutter,tvolkert/flutter,Hixie/flutter,Hixie/flutter,turnidge/flutter,cbracken/flutter,turnidge/flutter,Hixie/flutter,Hixie/flutter,tvolkert/flutter,turnidge/flutter,Hixie/flutter,tvolkert/flutter,tvolkert/flutter,turnidge/flutter,tvolkert/flutter,Hixie/flutter,cbracken/flutter,cbracken/flutter,flutter/flutter,tvolkert/flutter,cbracken/flutter,flutter/flutter,cbracken/flutter,cbracken/flutter,flutter/flutter,Hixie/flutter,Hixie/flutter,flutter/flutter,flutter/flutter,flutter/flutter,tvolkert/flutter,flutter/flutter,Hixie/flutter,Hixie/flutter,cbracken/flutter,tvolkert/flutter,tvolkert/flutter,cbracken/flutter,tvolkert/flutter,flutter/flutter,cbracken/flutter,cbracken/flutter,turnidge/flutter