Bump rack from 2.2.8.1 to 2.2.9

[dependabot[bot]]

Bumps rack from 2.2.8.1 to 2.2.9.

Commits

• b1deebd Bump patch version.
• f7d40f9 Merge branch '2-2-sec' into 2-2-stable
• fdb12cb backport #2104 (#2121)
• 99057e6 Update CHANGELOG for 2.2.8 (#2107)
• 3314622 Adds missing 2.2.8 to CHANGELOG.md (#2106)
• See full diff in compare view

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