Update rack requirement from ~> 1.2 to ~> 3.0

[dependabot]

Updates the requirements on rack to permit the latest version.

Release notes

Sourced from rack's releases.

v3.0.7

What's Changed

• Backport "Make query parameters without = have nil values". by @​jeremyevans in rack/rack#2060

Full Changelog: rack/rack@v3.0.6.1...v3.0.7

Changelog

Sourced from rack's changelog.

[3.0.7] - 2023-03-16

• Make query parameters without = have nil values. (#2059, [@​jeremyevans])

[3.0.6.1] - 2023-03-13

• [CVE-2023-27539] Avoid ReDoS in header parsing

[3.0.6] - 2023-03-13

• Add QueryParser#missing_value for handling missing values + tests. (#2052, [@​ioquatix])

[3.0.5] - 2023-03-13

• Split form/query parsing into two steps. (#2038, @​matthewd)

[3.0.4.2] - 2023-03-02

• [CVE-2023-27530] Introduce multipart_total_part_limit to limit total parts

[3.0.4.1] - 2023-01-17

• [CVE-2022-44571] Fix ReDoS vulnerability in multipart parser
• [CVE-2022-44570] Fix ReDoS in Rack::Utils.get_byte_ranges
• [CVE-2022-44572] Forbid control characters in attributes (also ReDoS)

[3.0.4] - 2023-01-17

• Rack::Request#POST should consistently raise errors. Cache errors that occur when invoking Rack::Request#POST so they can be raised again later. (#2010, [@​ioquatix])
• Fix Rack::Lint error message for HTTP_CONTENT_TYPE and HTTP_CONTENT_LENGTH. (#2007, @​byroot)
• Extend Rack::MethodOverride to handle QueryParser::ParamsTooDeepError error. (#2006, @​byroot)

[3.0.3] - 2022-12-27

Fixed

• Rack::URLMap uses non-deprecated form of Regexp.new. (#1998, @​weizheheng)

[3.0.2] -2022-12-05

Fixed

• Utils.build_nested_query URL-encodes nested field names including the square brackets.
• Allow Rack::Response to pass through streaming bodies. (#1993, [@​ioquatix])

[3.0.1] - 2022-11-18

Fixed

• MethodOverride does not look for an override if a request does not include form/parseable data.

... (truncated)

Commits

• 2429b7b Bump patch version.
• 94dd78b Update changelog.
• d38b456 Make query parameters without = have nil values (#2059) (#2060)
• 51e7a0f Merge branch '3-0-sec' into 3-0-stable
• 098d8e1 bump version
• 231ef36 Avoid ReDoS problem
• 54a9ed2 Update changelog.
• e9e9ae6 Bump patch version.
• 848c9c0 Add QueryParser#missing_value for handling missing values + tests. (#2052)
• 9f8ba5e Bump patch version.
• Additional commits viewable in compare view

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[dependabot]

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