[Security] Bump rack from 2.0.1 to 2.0.6

[dependabot-preview[bot]]

Bumps rack from 2.0.1 to 2.0.6. This update includes security fixes.

Vulnerabilities fixed

*Sourced from [The Ruby Advisory Database](https://github.com/rubysec/ruby-advisory-db/blob/master/gems/rack/CVE-2018-16471.yml).* > **Possible XSS vulnerability in Rack** > There is a possible vulnerability in Rack. This vulnerability has been > assigned the CVE identifier CVE-2018-16471. > > Versions Affected: All. > Not affected: None. > Fixed Versions: 2.0.6, 1.6.11 > > Impact > ------ > There is a possible XSS vulnerability in Rack. Carefully crafted requests can > impact the data returned by the `scheme` method on `Rack::Request`. > Applications that expect the scheme to be limited to "http" or "https" and do > not escape the return value could be vulnerable to an XSS attack. > > Vulnerable code looks something like this: > > ``` > <%= request.scheme.html_safe %> > ``` > > ... (truncated) > > Patched versions: \~> 1.6.11; >= 2.0.6 > Unaffected versions: none

Commits

- [`8376dd1`](https://github.com/rack/rack/commit/8376dd11e6526a53432ee59b7a5d092bda9fc901) Bumping version for release - [`313dd6a`](https://github.com/rack/rack/commit/313dd6a05a5924ed6c82072299c53fed09e39ae7) Whitelist http/https schemes - [`37c1160`](https://github.com/rack/rack/commit/37c1160b2360074d20858792f23a7eb3afeabebd) Reduce buffer size to avoid pathological parsing - [`99fea65`](https://github.com/rack/rack/commit/99fea65cc04eaaad8e59b1a78440a2616e0dc55a) Merge tag '2.0.5' into 2-0-stable - [`216b7ca`](https://github.com/rack/rack/commit/216b7cad1baa65ba1213ae51c85776928d6e2d86) Merge pull request [#1296](https://github-redirect.dependabot.com/rack/rack/issues/1296) from tomelm/fix-prefers-plaintext - [`decd976`](https://github.com/rack/rack/commit/decd97682ec4c6345fe359b6a1d3c51e5fbdce5b) Bump version for release - [`957f596`](https://github.com/rack/rack/commit/957f5962afd1c4b70dd944ecffa636495c1ffd61) Merge pull request [#1268](https://github-redirect.dependabot.com/rack/rack/issues/1268) from eileencodes/forwardport-pr-1249-to-2-0-stable - [`00e109e`](https://github.com/rack/rack/commit/00e109e2ba29696ec3dc1e5b3ef2d313a2d04497) Merge pull request [#1249](https://github-redirect.dependabot.com/rack/rack/issues/1249) from mclark/handle-invalid-method-parameters - [`27c33b0`](https://github.com/rack/rack/commit/27c33b01a1bd75b6268db9d38b88576ebef7dd22) Stick with a passing version of Rubygems and bundler - [`d4283e4`](https://github.com/rack/rack/commit/d4283e4fb14b7d9f5f0ef7bb90d36476a9a6ece0) Leahize - Additional commits viewable in [compare view](https://github.com/rack/rack/compare/2.0.1...2.0.6)

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[dependabot-preview[bot]]

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