Maintenance: Bump redis from 4.5.1 to 4.6.0

Bumps [redis](https://github.com/redis/redis-rb) from 4.5.1 to 4.6.0.
- [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/v4.5.1...v4.6.0)

Gemfile.lock

@@ -474,7 +474,7 @@ GEM
     rb-inotify (0.10.1)
       ffi (~> 1.0)
     rchardet (1.8.0)
-    redis (4.5.1)
+    redis (4.6.0)
     regexp_parser (2.2.0)
     rest-client (2.1.0)
       http-accept (>= 1.7.0, < 2.0)