Upgrade Rack to 2.2.20
What does this MR do and why?
Upgrade the Rack gem to the latest patch release
Diff: https://my.diffend.io/gems/rack/2.2.18/2.2.20
Changelog: https://github.com/rack/rack/blob/v2.2.20/CHANGELOG.md
MR acceptance checklist
Evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.
Edited by Heinrich Lee Yu