Bump rack from 2.2.8 to 2.2.9 in /config/templates/omnibus-gitlab-gems

Bumps [rack](https://github.com/rack/rack) from 2.2.8 to 2.2.9.
- [Release notes](https://github.com/rack/rack/releases)
- [Changelog](https://github.com/rack/rack/blob/main/CHANGELOG.md)
- [Commits](rack/rack@v2.2.8...v2.2.9)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

config/templates/omnibus-gitlab-gems/Gemfile.lock

@@ -261,7 +261,7 @@ GEM
       method_source (~> 1.0)
     public_suffix (5.0.4)
     racc (1.7.3)
-    rack (2.2.8)
+    rack (2.2.9)
     rainbow (3.1.1)
     remote_syslog (1.6.15)
       em-resolv-replace