build(deps): bump rackup from 2.2.0 to 2.2.1 in /assets/hello-world

Bumps [rackup](https://github.com/rack/rackup) from 2.2.0 to 2.2.1.
- [Release notes](https://github.com/rack/rackup/releases)
- [Changelog](https://github.com/rack/rackup/blob/main/releases.md)
- [Commits](rack/rackup@v2.2.0...v2.2.1)

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

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

assets/hello-world/Gemfile.lock

@@ -2,7 +2,7 @@ GEM
   remote: https://rubygems.org/
   specs:
     rack (3.1.8)
-    rackup (2.2.0)
+    rackup (2.2.1)
       rack (>= 3)
     webrick (1.9.0)