Bump http from 0.13.5 to 1.1.0 in /lib/web_ui (#45791)

Bumps [http](https://github.com/dart-lang/http/tree/master/pkgs) from 0.13.5 to 1.1.0.
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<li>See full diff in <a href="https://github.com/dart-lang/http/commits/http-v1.1.0/pkgs">compare view</a></li>
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lib/web_ui/pubspec.yaml

@@ -24,7 +24,7 @@ dev_dependencies:
   convert: any
   crypto: any
   html: 0.15.0
-  http: 0.13.5
+  http: 1.1.0
   http_multi_server: any
   image: 3.0.1
   matcher: 0.12.14