Bump rack from 1.6.4 to 1.6.11

[dependabot[bot]]

Bumps rack from 1.6.4 to 1.6.11.

Commits

• 2bef132 Bumping version for release
• 97ca63d Whitelist http/https schemes
• 7b5054e Merge pull request #1296 from tomelm/fix-prefers-plaintext
• fdcd03a Bump version for release
• 2293c6a Merge pull request #1249 from mclark/handle-invalid-method-parameters
• b27dd86 handle failure to upcase invalid strings
• 274d934 Stick with a passing version of Rubygems and bundler
• 617aac0 bump version for release
• dc017e7 Merge pull request #1237 from eileencodes/backport-1137
• 4d6965a Backport pull request #1137 from unabridged/fix-eof-failure
• Additional commits viewable in compare view

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