Bump sidekiq from 6.1.3 to 6.2.0

Bumps [sidekiq](https://github.com/mperham/sidekiq) from 6.1.3 to 6.2.0.
- [Release notes](https://github.com/mperham/sidekiq/releases)
- [Changelog](https://github.com/mperham/sidekiq/blob/master/Changes.md)
- [Commits](sidekiq/sidekiq@v6.1.3...v6.2.0)

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

Gemfile

@@ -62,7 +62,7 @@ gem 'paper_trail'
 # 非同期処理
 gem 'redis'
 gem 'redis-namespace', git: 'https://github.com/resque/redis-namespace.git', branch: 'master'
-gem 'sidekiq', '6.1.3'
+gem 'sidekiq', '6.2.0'
 gem 'sinatra', require: false
 # 管理画面
 gem 'administrate'

Gemfile.lock

@@ -503,7 +503,7 @@ GEM
     sentry-raven (3.1.1)
       faraday (>= 1.0)
     shellany (0.0.1)
-    sidekiq (6.1.3)
+    sidekiq (6.2.0)
       connection_pool (>= 2.2.2)
       rack (~> 2.0)
       redis (>= 4.2.0)
@@ -640,7 +640,7 @@ DEPENDENCIES
   seed-fu
   selenium-webdriver!
   sentry-raven
-  sidekiq (= 6.1.3)
+  sidekiq (= 6.2.0)
   simplecov (< 0.18.0)
   sinatra
   sitemap_generator