Bump the reliable fetcher to 0.5.6

This allows configuring the BRPOP timeout

https://my.diffend.io/gems/gitlab-sidekiq-fetcher/0.5.5/0.5.6

Gemfile

@@ -198,7 +198,7 @@ gem 'acts-as-taggable-on', '~> 7.0'
 gem 'sidekiq', '~> 5.2.7'
 gem 'sidekiq-cron', '~> 1.0'
 gem 'redis-namespace', '~> 1.7.0'
-gem 'gitlab-sidekiq-fetcher', '0.5.5', require: 'sidekiq-reliable-fetch'
+gem 'gitlab-sidekiq-fetcher', '0.5.6', require: 'sidekiq-reliable-fetch'
 
 # Cron Parser
 gem 'fugit', '~> 1.2.1'

Gemfile.lock

@@ -472,7 +472,7 @@ GEM
     gitlab-pry-byebug (3.9.0)
       byebug (~> 11.0)
       pry (~> 0.13.0)
-    gitlab-sidekiq-fetcher (0.5.5)
+    gitlab-sidekiq-fetcher (0.5.6)
       sidekiq (~> 5)
     gitlab-styles (6.2.0)
       rubocop (~> 0.91, >= 0.91.1)
@@ -1443,7 +1443,7 @@ DEPENDENCIES
   gitlab-markup (~> 1.7.1)
   gitlab-net-dns (~> 0.9.1)
   gitlab-pry-byebug
-  gitlab-sidekiq-fetcher (= 0.5.5)
+  gitlab-sidekiq-fetcher (= 0.5.6)
   gitlab-styles (~> 6.2.0)
   gitlab_chronic_duration (~> 0.10.6.2)
   gitlab_omniauth-ldap (~> 2.1.1)