Update sidekiq requirement from >= 4.0, < 6 to >= 4.0, < 7

[dependabot[bot]]

Updates the requirements on sidekiq to permit the latest version.

Changelog

Sourced from sidekiq's changelog.

5.2.8

• Lock to Rack 2.0.x to prevent future incompatibilities
• Fix invalid reference in sidekiqctl

5.2.7

• Fix stale enqueued_at when retrying #4149
• Move build to Circle CI #4120

5.2.6

• Fix edge case where a job failure during Redis outage could result in a lost job #4141
• Better handling of malformed job arguments in payload #4095
• Restore bootstap's dropdown css component [#4099, urkle]
• Display human-friendly time diff for longer queue latencies [#4111, interlinked]
• Allow Sidekiq::Worker#set to be chained

5.2.5

• Fix default usage of config/sidekiq.yml [#4077, Tensho]

5.2.4

• Add warnings for various deprecations and changes coming in Sidekiq 6.0. See the 6-0 branch. #4056
• Various improvements to the Sidekiq test suite and coverage [#4026, #4039, Tensho]

5.2.3

• Warning message on invalid REDIS_PROVIDER #3970
• Add sidekiqctl status command [#4003, dzunk]
• Update elapsed time calculatons to use monotonic clock #3999
• Fix a few issues with mobile Web UI styling [#3973, navied]
• Jobs with retry: false now go through the global death_handlers, meaning you can take action on failed ephemeral jobs. [#3980, Benjamin-Dobell]
• Fix race condition in defining Workers. [#3997, mattbooks]

5.2.2

• Raise error for duplicate queue names in config to avoid unexpected fetch algorithm change #3911
• Fix concurrency bug on JRuby [#3958, mattbooks]
• Add "Kill All" button to the retries page #3938

... (truncated)

Commits

• a5ada83 release
• 315d83f Fixes regression after refactoring (Closes #4456) (#4457)
• 69b8f69 bump
• 7026c8f Lock Sidekiq 5 to Rack <2.1 to avoid breaking changes, #4440
• ec3e138 Fix Rails::VERSION check for sinatra and ActiveRecord (#4433)
• c00f8e7 polish
• de9ad88 move off travis
• 5d429ae cifix
• a07e5b1 fix
• 103601e circleci
• Additional commits viewable in compare view

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