Update rack to v2.2.8.1

Stan Hurequested to merge
sh-update-rack-2.2.8.1 into master

What does this MR do and why?

This addresses CVE-2024-25126, CVE-2024-26146, and CVE-2024-26141.

Diff: https://my.diffend.io/gems/rack/2.2.8/2.2.8.1

Relates to https://gitlab.com/gitlab-org/gitlab/-/issues/442679

Edited by Stan Hu

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