Remove -dev.infinity in SDK upper constraint

pkgs/stream_channel/pubspec.yaml

diff --git a/pkgs/stream_channel/pubspec.yaml b/pkgs/stream_channel/pubspec.yaml
index 5813c4a..2d86362 100644
--- a/pkgs/stream_channel/pubspec.yaml
+++ b/pkgs/stream_channel/pubspec.yaml
@@ -4,7 +4,7 @@
 author: Dart Team <misc@dartlang.org>
 homepage: https://github.com/dart-lang/stream_channel
 environment:
-  sdk: '>=1.21.0 <2.0.0-dev.infinity'
+  sdk: '>=1.21.0 <2.0.0'
 dependencies:
   async: '^1.11.0'
   stack_trace: '^1.0.0'