Update `topics` in package "http" (#1205)

pkgs/http/pubspec.yaml

diff --git a/pkgs/http/pubspec.yaml b/pkgs/http/pubspec.yaml
index fca33f8..b133164 100644
--- a/pkgs/http/pubspec.yaml
+++ b/pkgs/http/pubspec.yaml
@@ -2,9 +2,11 @@
 version: 1.2.2-wip
 description: A composable, multi-platform, Future-based API for HTTP requests.
 repository: https://github.com/dart-lang/http/tree/master/pkgs/http
+
 topics:
  - http
  - network
+ - protocols
 
 environment:
   sdk: ^3.3.0