Update rack from 2.2.3 to 2.2.4

What does this MR do?

Updates rack from 2.2.3 to 2.2.4 to address CVE-2022-30122 and CVE-2022-30123.

rack gem is required by chef-zero and rubocop-rails.

graph TD
  subgraph test
    chefspec
  end
  subgraph rubocop
    gitlab-styles --> rubocop-rails
  end
  subgraph default
    chefspec --> chef-cli
    chef-cli --> chef
    chef --> chef-zero
    chef-zero --> rack
    chefspec --> chef
    rubocop-rails --> rack
  end

Related issues

n/a

Checklist

See Definition of done.

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Required

• Merge Request Title, and Description are up to date, accurate, and descriptive
• MR targeting the appropriate branch
• MR has a green pipeline on GitLab.com
• [n/a] Pipeline is green on dev.gitlab.org if the change is touching anything besides documentation or internal cookbooks
• trigger-package has a green pipeline running against latest commit

Expected (please provide an explanation if not completing)

• [n/a] Test plan indicating conditions for success has been posted and passes
• [n/a] Documentation created/updated
• [n/a] Tests added
• [n/a] Integration tests added to GitLab QA
• [n/a] Equivalent MR/issue for the GitLab Chart opened