Bump redis from 4.1.4 to 4.2.1 (#14038)

Bumps [redis](https://github.com/redis/redis-rb) from 4.1.4 to 4.2.1.
- [Release notes](https://github.com/redis/redis-rb/releases)
- [Changelog](https://github.com/redis/redis-rb/blob/master/CHANGELOG.md)
- [Commits](https://github.com/redis/redis-rb/compare/v4.1.4...v4.2.1)

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Gemfile

@@ -80,7 +80,7 @@ gem 'rack-attack', '~> 6.3'
 gem 'rack-cors', '~> 1.1', require: 'rack/cors'
 gem 'rails-i18n', '~> 5.1'
 gem 'rails-settings-cached', '~> 0.6'
-gem 'redis', '~> 4.1', require: ['redis', 'redis/connection/hiredis']
+gem 'redis', '~> 4.2', require: ['redis', 'redis/connection/hiredis']
 gem 'mario-redis-lock', '~> 1.2', require: 'redis_lock'
 gem 'rqrcode', '~> 1.1'
 gem 'ruby-progressbar', '~> 1.10'

Gemfile.lock

@@ -490,7 +490,7 @@ GEM
       link_header (~> 0.0, >= 0.0.8)
     rdf-normalize (0.4.0)
       rdf (~> 3.1)
-    redis (4.1.4)
+    redis (4.2.1)
     redis-actionpack (5.2.0)
       actionpack (>= 5, < 7)
       redis-rack (>= 2.1.0, < 3)
@@ -765,7 +765,7 @@ DEPENDENCIES
   rails-i18n (~> 5.1)
   rails-settings-cached (~> 0.6)
   rdf-normalize (~> 0.4)
-  redis (~> 4.1)
+  redis (~> 4.2)
   redis-namespace (~> 1.7)
   redis-rails (~> 5.0)
   rqrcode (~> 1.1)