build(deps): bump redis from 4.8.1 to 5.2.0

Bumps [redis](https://github.com/redis/redis-rb) from 4.8.1 to 5.2.0.
- [Changelog](https://github.com/redis/redis-rb/blob/master/CHANGELOG.md)
- [Commits](redis/redis-rb@v4.8.1...v5.2.0)

---
updated-dependencies:
- dependency-name: redis
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Gemfile

@@ -41,7 +41,7 @@ gem 'i18n-js'
 gem 'rails-i18n', '~> 7.0.0'
 
 # Redis
-gem 'redis', '~> 4.8.1'
+gem 'redis', '~> 5.2.0'
 
 # Exam template requirements
 gem 'combine_pdf'

Gemfile.lock

@@ -367,7 +367,10 @@ GEM
     rdoc (6.6.3.1)
       psych (>= 4.0.0)
     redcarpet (3.6.0)
-    redis (4.8.1)
+    redis (5.2.0)
+      redis-client (>= 0.22.0)
+    redis-client (0.22.1)
+      connection_pool
     redis-namespace (1.11.0)
       redis (>= 4)
     regexp_parser (2.9.0)
@@ -543,7 +546,7 @@ DEPENDENCIES
   rails-i18n (~> 7.0.0)
   rails_performance
   redcarpet
-  redis (~> 4.8.1)
+  redis (~> 5.2.0)
   responders
   resque
   resque-scheduler