Downgrade sidekiq version from 7.1.4 to 6.5.9

staging and production environments only provide redis version 6.0.14
and since sidekiq version 7 the minimun redis version in 6.2

Gemfile

@@ -74,7 +74,7 @@ group :development do
   gem "web-console"
 end
 
-gem "sidekiq", "~> 7.1"
+gem "sidekiq", "~> 6.5"
 
 gem "sidekiq-cron", "~> 1.10"
 

Gemfile.lock

@@ -314,8 +314,7 @@ GEM
       zeitwerk (~> 2.5)
     rainbow (3.1.1)
     rake (13.0.6)
-    redis-client (0.17.0)
-      connection_pool
+    redis (4.8.1)
     regexp_parser (2.8.1)
     reline (0.3.4)
       io-console (~> 0.5)
@@ -391,11 +390,10 @@ GEM
       concurrent-ruby (~> 1.0, >= 1.0.2)
     shoulda-matchers (5.3.0)
       activesupport (>= 5.2.0)
-    sidekiq (7.1.4)
-      concurrent-ruby (< 2)
-      connection_pool (>= 2.3.0)
-      rack (>= 2.2.4)
-      redis-client (>= 0.14.0)
+    sidekiq (6.5.9)
+      connection_pool (>= 2.2.5, < 3)
+      rack (~> 2.0)
+      redis (>= 4.5.0, < 5)
     sidekiq-cron (1.10.1)
       fugit (~> 1.8)
       globalid (>= 1.0.1)
@@ -488,7 +486,7 @@ DEPENDENCIES
   scenic
   sentry-rails (~> 5.11)
   shoulda-matchers (~> 5.0)
-  sidekiq (~> 7.1)
+  sidekiq (~> 6.5)
   sidekiq-cron (~> 1.10)
   simplecov
   sprockets-rails