Update rack-contrib requirement from ~> 1.0 to >= 1, < 3

[dependabot-preview]

Updates the requirements on rack-contrib to permit the latest version.

Release notes

Sourced from rack-contrib's releases.

End of an era: support ending for Rack 1.x

This is intended to be the final release of rack-contrib with support for
the Rack 1.x series. Deprecations have been added for the
non-backwards-compatible changes, so you can get a sense of what will need
to be fixed.

Regular changes in this release:

• Rack::Locale: use a default locale (specified by I18n.default_locale = :<something>) if no available locale matches the Accept header.
  (Hiroki Yoshioka)

• Our test suite is now minitest 6 compliant, since all deprecation warnings
  have been cleaned up. (Skye Shaw)

Deprecation warnings added:

• Rack::Sendfile is gone, because there's a better one in Rack itself. If
  your code loads rack/contrib/sendfile, you'll get a warning.

• Rack::NestedParams behaviour has changed if multiple instances of the same
  variable are found in a query string (foo=1&foo=2 currently evaluates to
  foo=1; it will evaluate to foo=2 in rack-contrib 2.x). This is
  necessary because we're using Rack's built-in query string parsing rather
  than our own rather ugly implementation. If you hit the changed
  behaviour, you'll get a warning. (Skye Shaw)

• Rack::AcceptFormat -- whilst this has been deprecated for a while, it's
  worth reiterating that if you're still using this thing, you should really
  stop. It's sooooo bad.

Commits

• See full diff in compare view

Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting @dependabot rebase.

---

Note: This repo was added to Dependabot recently, so you'll receive a maximum of 5 PRs for your first few update runs. Once an update run creates fewer than 5 PRs we'll remove that limit.

You can always request more updates by clicking Bump now in your Dependabot dashboard.

Dependabot commands and options

You can trigger Dependabot actions by commenting on this PR:

• @dependabot rebase will rebase this PR
• @dependabot recreate will recreate this PR, overwriting any edits that have been made to it
• @dependabot merge will merge this PR after your CI passes on it
• @dependabot cancel merge will cancel a previously requested merge
• @dependabot reopen will reopen this PR if it is closed
• @dependabot ignore this [patch|minor|major] version will close this PR and stop Dependabot creating any more for this minor/major version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this dependency will close this PR and stop Dependabot creating any more for this dependency (unless you reopen the PR or upgrade to it yourself)
• @dependabot use these labels will set the current labels as the default for future PRs for this repo and language
• @dependabot use these reviewers will set the current reviewers as the default for future PRs for this repo and language
• @dependabot use these assignees will set the current assignees as the default for future PRs for this repo and language
• @dependabot use this milestone will set the current milestone as the default for future PRs for this repo and language
• @dependabot badge me will comment on this PR with code to add a "Dependabot enabled" badge to your readme

Additionally, you can set the following in your Dependabot dashboard:

• Update frequency (including time of day and day of week)
• Automerge options (never/patch/minor, and dev/runtime dependencies)
• Pull request limits (per update run and/or open at any time)
• Out-of-range updates (receive only lockfile updates, if desired)
• Security updates (receive only security updates, if desired)

Finally, you can contact us by mentioning @dependabot.

[reidab]

@dependabot rebase