dependabot/bundler/rack-2.2.6.4 Bump rack from 2.2.6.2 to 2.2.6.4

Bumps [rack](https://github.com/rack/rack) from 2.2.6.2 to 2.2.6.4.
- [Release notes](https://github.com/rack/rack/releases)
- [Changelog](https://github.com/rack/rack/blob/main/CHANGELOG.md)
- [Commits](https://github.com/rack/rack/compare/v2.2.6.2...v2.2.6.4)

---
updated-dependencies:
- dependency-name: rack
dependency-type: direct:production
...

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