Bump http from 0.13.4 to 0.13.5 in /example (#907)

Bumps [http](https://github.com/dart-lang/http/tree/master/pkgs) from 0.13.4 to 0.13.5.
- [Release notes](https://github.com/dart-lang/http/releases)
- [Commits](https://github.com/dart-lang/http/commits/HEAD/pkgs)

---
updated-dependencies:
- dependency-name: http
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
diff --git a/example/pubspec.lock b/example/pubspec.lock
index 5f11b48..5ea0749 100644
--- a/example/pubspec.lock
+++ b/example/pubspec.lock
@@ -203,7 +203,7 @@
       name: http
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.13.4"
+    version: "0.13.5"
   http_multi_server:
     dependency: transitive
     description: