Bump rack from 1.6.4 to 2.1.4.2

[dependabot[bot]]

Bumps rack from 1.6.4 to 2.1.4.2.

Commits

• 8b8efd9 Merge branch '2-1-sec' into 2-1-stable
• 42d840b bump version
• 1836716 Update changelog
• 9b5fb5c Fix ReDoS vulnerability in multipart parser
• f66ef5c Fix ReDoS in Rack::Utils.get_byte_ranges
• 8291f50 Forbid control characters in attributes
• ffcc4b3 Merge branch '2-1-sec' into 2-1-stable
• 374f89a update changelog
• b8722dc bump version
• bbb1e85 Escape untrusted text when logging
• Additional commits viewable in compare view

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