Bump rackup from 2.1.0 to 2.2.0

[dependabot[bot]]

Bumps rackup from 2.1.0 to 2.2.0.

Changelog

Sourced from rackup's changelog.

v2.2.0

• Remove old rack shims.
• Remove webrick dependency.

Commits

• 7f6d2aa Bump minor version.
• 76a7320 Move development dependencies to gems.rb.
• 1f3ece0 Update copyrights.
• 20d41c6 Automate release notes.
• 4e72d9d Remove unused rack classes (#10)
• 30e444a Restore puma external tests. (#24)
• be54595 Soft deprecate webrick and add some details as to why. (#23)
• eaea0ea Normalize gemspec.
• 94017d1 Update authors/copyright.
• bff2ba1 Update actions/checkout@v3 to v4.
• Additional commits viewable in compare view

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[dependabot[bot]]

Looks like rackup is up-to-date now, so this is no longer needed.