Bump sidekiq from 5.1.0 to 5.1.2

[dependabot-preview[bot]]

Bumps sidekiq from 5.1.0 to 5.1.2.

Changelog

*Sourced from sidekiq's [changelog](https://github.com/mperham/sidekiq/blob/master/Changes.md).* > 5.1.2 > ----------- > > - Add link to docs in Web UI footer > - Fix crash on Ctrl-C in Windows [#3775, Bernica] > - Remove `freeze` calls on String constants. This is superfluous with Ruby > 2.3+ and `frozen_string_literal: true`. [#3759] > - Fix use of AR middleware outside of Rails [#3787] > - Sidekiq::Worker `sidekiq_retry_in` block can now return nil or 0 to use > the default backoff delay [#3796, dsalahutdinov] > > 5.1.1 > ----------- > > - Fix Web UI incompatibility with Redis 3.x gem [#3749]

Commits

- [`c262f76`](https://github.com/mperham/sidekiq/commit/c262f7635a58b1302e3290aae090a2cc29fbccfe) release - [`b23c0ec`](https://github.com/mperham/sidekiq/commit/b23c0ecf8ea18a6547d40fb9fe3b92eceed8107f) Use `RAILS_MAX_THREADS` for client pool size - [`60a41d3`](https://github.com/mperham/sidekiq/commit/60a41d3f36db25ff2bebade5bb516d38d4240b7b) change - [`82bdae8`](https://github.com/mperham/sidekiq/commit/82bdae86039b58d5541b5799afffcfcefbf9ef53) Add link to docs in footer - [`86ca02f`](https://github.com/mperham/sidekiq/commit/86ca02f1d905ce7dc84d812ad71676720c62441e) Refactor, changes - [`7448351`](https://github.com/mperham/sidekiq/commit/7448351d733cbb38e8a5000d19b111bcea4fbc9e) fix: use default when returned 0 - [`611f7cd`](https://github.com/mperham/sidekiq/commit/611f7cd31f6ca27b90ab43a9772eb1926c9bb77f) Use default retry interval in sidekiq_retry_in - [`1aad7b5`](https://github.com/mperham/sidekiq/commit/1aad7b52eef2d85b67854d17226d0b8c6bbb03b2) fixes - [`967f3f3`](https://github.com/mperham/sidekiq/commit/967f3f34bd014c8ef749f6a6fd6f710d5512579c) Add missing preamble for [**krzysiek1507**](https://github.com/krzysiek1507), [#3759](https://github-redirect.dependabot.com/mperham/sidekiq/issues/3759) - [`aa46700`](https://github.com/mperham/sidekiq/commit/aa46700500c74644d13e2217e20bca06abd5a265) Allow use of AR middleware outside of Rails proper, fixes [#3787](https://github-redirect.dependabot.com/mperham/sidekiq/issues/3787) - Additional commits viewable in [compare view](https://github.com/mperham/sidekiq/compare/v5.1.0...v5.1.2)

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Superseded by #1193.