Update pubspec.yaml

Co-authored-by: Nate Bosch <nbosch@google.com>
diff --git a/pubspec.yaml b/pubspec.yaml
index bdf1afd..99618b8 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -12,6 +12,6 @@
   stream_channel: ^2.1.0
 
 dev_dependencies:
-  lints: ^1.0.0
+  lints: ^2.0.0
   test: ^1.16.0
   web_socket_channel: ^2.0.0