Remove -dev.infinity in SDK upper constraint

pkgs/web_socket_channel/pubspec.yaml

diff --git a/pkgs/web_socket_channel/pubspec.yaml b/pkgs/web_socket_channel/pubspec.yaml
index 31d3a8f..e9926ec 100644
--- a/pkgs/web_socket_channel/pubspec.yaml
+++ b/pkgs/web_socket_channel/pubspec.yaml
@@ -5,7 +5,7 @@
 homepage: https://github.com/dart-lang/web_socket_channel
 
 environment:
-  sdk: '>=1.13.0 <2.0.0-dev.infinity'
+  sdk: '>=1.13.0 <2.0.0'
 
 dependencies:
   async: '^1.3.0'