Pin redis to 4.1.x, update redis-namespace

Gemfile

@@ -197,7 +197,7 @@ gem 'acts-as-taggable-on', '~> 7.0'
 # Background jobs
 gem 'sidekiq', '~> 5.2.7'
 gem 'sidekiq-cron', '~> 1.0'
-gem 'redis-namespace', '~> 1.7.0'
+gem 'redis-namespace', '~> 1.8.1'
 gem 'gitlab-sidekiq-fetcher', '0.5.6', require: 'sidekiq-reliable-fetch'
 
 # Cron Parser
@@ -229,7 +229,7 @@ gem 'js_regex', '~> 3.4'
 gem 'device_detector'
 
 # Redis
-gem 'redis', '~> 4.0'
+gem 'redis', '~> 4.1.4'
 gem 'connection_pool', '~> 2.0'
 
 # Redis session store

Gemfile.lock

@@ -1030,7 +1030,7 @@ GEM
     recaptcha (4.13.1)
       json
     recursive-open-struct (1.1.2)
-    redis (4.1.3)
+    redis (4.1.4)
     redis-actionpack (5.2.0)
       actionpack (>= 5, < 7)
       redis-rack (>= 2.1.0, < 3)
@@ -1038,7 +1038,7 @@ GEM
     redis-activesupport (5.2.0)
       activesupport (>= 3, < 7)
       redis-store (>= 1.3, < 2)
-    redis-namespace (1.7.0)
+    redis-namespace (1.8.1)
       redis (>= 3.0.4)
     redis-rack (2.1.2)
       rack (>= 2.0.8, < 3)
@@ -1609,8 +1609,8 @@ DEPENDENCIES
   rbtrace (~> 0.4)
   re2 (~> 1.2.0)
   recaptcha (~> 4.11)
-  redis (~> 4.0)
-  redis-namespace (~> 1.7.0)
+  redis (~> 4.1.4)
+  redis-namespace (~> 1.8.1)
   redis-rails (~> 5.0.2)
   request_store (~> 1.5)
   responders (~> 3.0)