Bump rack-test from 2.1.0 to 2.2.0

Bumps [rack-test](https://github.com/rack/rack-test) from 2.1.0 to 2.2.0.
- [Release notes](https://github.com/rack/rack-test/releases)
- [Changelog](https://github.com/rack/rack-test/blob/main/History.md)
- [Commits](rack/rack-test@v2.1.0...v2.2.0)

---
updated-dependencies:
- dependency-name: rack-test
  dependency-version: 2.2.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

Gemfile.lock

@@ -83,7 +83,7 @@ GEM
     public_suffix (5.1.1)
     racc (1.8.1)
     rack (3.1.15)
-    rack-test (2.1.0)
+    rack-test (2.2.0)
       rack (>= 1.3)
     rainbow (3.1.1)
     rake (13.2.1)