Bump sidekiq from 5.2.7 to 6.0.4 (#11727)

* Bump sidekiq from 5.2.7 to 6.0.0

Bumps [sidekiq](https://github.com/mperham/sidekiq) from 5.2.7 to 6.0.0.
- [Release notes](https://github.com/mperham/sidekiq/releases)
- [Changelog](https://github.com/mperham/sidekiq/blob/master/Changes.md)
- [Commits](https://github.com/mperham/sidekiq/compare/v5.2.7...v6.0.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

* Sidekiq::Logger.logger -> Sidekiq.logger

* Drop support Ruby 2.4

* update

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>
Co-authored-by: Yamagishi Kazutoshi <ykzts@desire.sh>

Gemfile.lock

@@ -562,11 +562,11 @@ GEM
       crass (~> 1.0.2)
       nokogiri (>= 1.8.0)
       nokogumbo (~> 2.0)
-    sidekiq (5.2.7)
-      connection_pool (~> 2.2, >= 2.2.2)
-      rack (>= 1.5.0)
-      rack-protection (>= 1.5.0)
-      redis (>= 3.3.5, < 5)
+    sidekiq (6.0.4)
+      connection_pool (>= 2.2.2)
+      rack (>= 2.0.0)
+      rack-protection (>= 2.0.0)
+      redis (>= 4.1.0)
     sidekiq-bulk (0.2.0)
       sidekiq
     sidekiq-scheduler (3.0.1)
@@ -767,7 +767,7 @@ DEPENDENCIES
   rubocop-rails (~> 2.4)
   ruby-progressbar (~> 1.10)
   sanitize (~> 5.1)
-  sidekiq (~> 5.2)
+  sidekiq (~> 6.0)
   sidekiq-bulk (~> 0.2.0)
   sidekiq-scheduler (~> 3.0)
   sidekiq-unique-jobs (~> 6.0)