Backport reliable fetcher

Gemfile

@@ -169,7 +169,7 @@ gem 'acts-as-taggable-on', '~> 6.0'
 gem 'sidekiq', '~> 5.2.7'
 gem 'sidekiq-cron', '~> 1.0'
 gem 'redis-namespace', '~> 1.6.0'
-gem 'gitlab-sidekiq-fetcher', '~> 0.4.0', require: 'sidekiq-reliable-fetch'
+gem 'gitlab-sidekiq-fetcher', '0.5.2', require: 'sidekiq-reliable-fetch'
 # Cron Parser
 gem 'fugit', '~> 1.2.1'

Gemfile.lock

@@ -320,7 +320,7 @@ GEM
       jaeger-client (~> 0.10)
       opentracing (~> 0.4)
     gitlab-markup (1.7.0)
-    gitlab-sidekiq-fetcher (0.4.0)
+    gitlab-sidekiq-fetcher (0.5.2)
       sidekiq (~> 5)
     gitlab-styles (2.7.0)
       rubocop (~> 0.69.0)
@@ -1123,7 +1123,7 @@ DEPENDENCIES
   github-markup (~> 1.7.0)
   gitlab-labkit (~> 0.3.0)
   gitlab-markup (~> 1.7.0)
-  gitlab-sidekiq-fetcher (~> 0.4.0)
+  gitlab-sidekiq-fetcher (= 0.5.2)
   gitlab-styles (~> 2.7)
   gitlab_omniauth-ldap (~> 2.1.1)
   gon (~> 6.2)