Bump rack from 2.2.21 to 2.2.22 in /lib/rb

Bumps [rack](https://github.com/rack/rack) from 2.2.21 to 2.2.22.
- [Release notes](https://github.com/rack/rack/releases)
- [Changelog](https://github.com/rack/rack/blob/main/CHANGELOG.md)
- [Commits](https://github.com/rack/rack/compare/v2.2.21...v2.2.22)

---
updated-dependencies:
- dependency-name: rack
  dependency-version: 2.2.22
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <support@github.com>
diff --git a/lib/rb/Gemfile.lock b/lib/rb/Gemfile.lock
index e3d0d17..ea47938 100644
--- a/lib/rb/Gemfile.lock
+++ b/lib/rb/Gemfile.lock
@@ -28,7 +28,7 @@
     pry-stack_explorer (0.4.9.3)
       binding_of_caller (>= 0.7)
       pry (>= 0.9.11)
-    rack (2.2.21)
+    rack (2.2.22)
     rack-test (0.8.3)
       rack (>= 1.0, < 3)
     rake (13.3.1)