Bump rack from 2.2.4 to 2.2.6.2 in /examples/barley

Bumps [rack](https://github.com/rack/rack) from 2.2.4 to 2.2.6.2.
- [Release notes](https://github.com/rack/rack/releases)
- [Changelog](https://github.com/rack/rack/blob/main/CHANGELOG.md)
- [Commits](rack/rack@2.2.4...v2.2.6.2)

---
updated-dependencies:
- dependency-name: rack
  dependency-type: indirect
...

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

examples/barley/Gemfile.lock

@@ -34,7 +34,7 @@ GEM
     parslet (1.4.0)
       blankslate (~> 2.0)
     raabro (1.1.6)
-    rack (2.2.4)
+    rack (2.2.6.2)
     rack-protection (3.0.4)
       rack
     rb-fsevent (0.10.3)