Use latest version of package:sse in the MV3 Debug Extension (#1859)

Author: elliette

dwds/debug_extension_mv3/pubspec.yaml

@@ -20,12 +20,9 @@ dev_dependencies:
   built_value_generator: ^8.3.0
   build_web_compilers: ^3.0.0
   dwds: ^16.0.0
-  sse: ^4.1.0
+  sse: ^4.1.2
   web_socket_channel: ^2.2.0
 
 dependency_overrides:
   dwds:
     path: ..
-  # TODO(elliette): Remove override once package:sse is published.
-  sse:
-    path: /Users/elliottbrooks/dev/sse