Bump rack from 1.2.4 to 1.2.8

[dependabot]

Bumps rack from 1.2.4 to 1.2.8.

Changelog

Sourced from rack's changelog.

[1.1.6, 1.2.8, 1.3.10] 2013-02-07

• Fix CVE-2013-0263, timing attack against Rack::Session::Cookie

[1.5.1] 2013-01-28

• Rack::Lint check_hijack now conforms to other parts of SPEC
• Added hash-like methods to Abstract::ID::SessionHash for compatibility
• Various documentation corrections

[1.5.0] 2013-01-21

• Introduced hijack SPEC, for before-response and after-response hijacking
• SessionHash is no longer a Hash subclass
• Rack::File cache_control parameter is removed, in place of headers options
• Rack::Auth::AbstractRequest#scheme now yields strings, not symbols
• Rack::Utils cookie functions now format expires in RFC 2822 format
• Rack::File now has a default mime type
• rackup -b 'run Rack::Files.new(".")', option provides command line configs
• Rack::Deflater will no longer double encode bodies
• Rack::Mime#match? provides convenience for Accept header matching
• Rack::Utils#q_values provides splitting for Accept headers
• Rack::Utils#best_q_match provides a helper for Accept headers
• Rack::Handler.pick provides convenience for finding available servers
• Puma added to the list of default servers (preferred over Webrick)
• Various middleware now correctly close body when replacing it
• Rack::Request#params is no longer persistent with only GET params
• Rack::Request#update_param and #delete_param provide persistent operations
• Rack::Request#trusted_proxy? now returns true for local unix sockets
• Rack::Response no longer forces Content-Types
• Rack::Sendfile provides local mapping configuration options
• Rack::Utils#rfc2109 provides old netscape style time output
• Updated HTTP status codes
• Ruby 1.8.6 likely no longer passes tests, and is no longer fully supported

[1.4.4, 1.3.9, 1.2.7, 1.1.5] 2013-01-13

• [SEC] Rack::Auth::AbstractRequest no longer symbolizes arbitrary strings
• Fixed erroneous test case in the 1.3.x series

[1.4.3] 2013-01-07

• Security: Prevent unbounded reads in large multipart boundaries

[1.3.8] 2013-01-07

• Security: Prevent unbounded reads in large multipart boundaries

[1.4.2] 2013-01-06

• Add warnings when users do not provide a session secret
• Fix parsing performance for unquoted filenames
• Updated URI backports
• Fix URI backport version matching, and silence constant warnings
• Correct parameter parsing with empty values
• Correct rackup '-I' flag, to allow multiple uses
• Correct rackup pidfile handling

... (truncated)

Commits

• ba8c6c2 Bump version number
• e34683f Update README for todays releases
• aeb1c8d Use secure_compare for hmac comparison
• fa2db31 Add secure_compare to Rack::Utils
• 22ef9e1 Bump version
• f14f52a Update README for release. Add security section.
• e52d741 Squash warnings in spec_auth
• dd1f800 Reimplement auth scheme fix
• 14c6173 Revert incorrect change to release number
• 80e524e Bump to 1.2.6
• Additional commits viewable in compare view

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