Bump rack from 1.6.4 to 1.6.11

[dependabot[bot]]

Bumps rack from 1.6.4 to 1.6.11.

Commits

- [`2bef132`](https://github.com/rack/rack/commit/2bef132505cb2f80c432e3f4526dfef969cd2e25) Bumping version for release - [`97ca63d`](https://github.com/rack/rack/commit/97ca63d87d88b4088fb1995b14103d4fe6a5e594) Whitelist http/https schemes - [`7b5054e`](https://github.com/rack/rack/commit/7b5054eedfdbd8f7dd5f348b0a02678b64fdd9de) Merge pull request [#1296](https://github-redirect.dependabot.com/rack/rack/issues/1296) from tomelm/fix-prefers-plaintext - [`fdcd03a`](https://github.com/rack/rack/commit/fdcd03a3c5a1c51d1f96fc97f9dfa1a9deac0c77) Bump version for release - [`2293c6a`](https://github.com/rack/rack/commit/2293c6a21925a70a2e9e67138edd341c5418ec4b) Merge pull request [#1249](https://github-redirect.dependabot.com/rack/rack/issues/1249) from mclark/handle-invalid-method-parameters - [`b27dd86`](https://github.com/rack/rack/commit/b27dd86738c21110cc5e8befa2fa217f81124ee3) handle failure to upcase invalid strings - [`274d934`](https://github.com/rack/rack/commit/274d934f32cc08a550f9e37bfdced7e228b42196) Stick with a passing version of Rubygems and bundler - [`617aac0`](https://github.com/rack/rack/commit/617aac0fb89f25603afc2b6497fdc3333354aee5) bump version for release - [`dc017e7`](https://github.com/rack/rack/commit/dc017e78612ae96e222cee8619dba0bb1dbc11a9) Merge pull request [#1237](https://github-redirect.dependabot.com/rack/rack/issues/1237) from eileencodes/backport-1137 - [`4d6965a`](https://github.com/rack/rack/commit/4d6965abb840d4543bcaf00e96482afe94442045) Backport pull request [#1137](https://github-redirect.dependabot.com/rack/rack/issues/1137) from unabridged/fix-eof-failure - Additional commits viewable in [compare view](https://github.com/rack/rack/compare/1.6.4...1.6.11)

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Superseded by #89.