Bump redis from 3.0.6 to 5.2.0

Bumps [redis](https://github.com/redis/redis-rb) from 3.0.6 to 5.2.0.
- [Changelog](https://github.com/redis/redis-rb/blob/master/CHANGELOG.md)
- [Commits](redis/redis-rb@v3.0.6...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.lock

@@ -1,8 +1,12 @@
 GEM
   remote: https://rubygems.org/
   specs:
+    connection_pool (2.4.1)
     gearman-ruby (3.0.7)
-    redis (3.0.6)
+    redis (5.2.0)
+      redis-client (>= 0.22.0)
+    redis-client (0.22.2)
+      connection_pool
 
 PLATFORMS
   ruby