Bump redis from 4.5.1 to 4.6.0 in /src/chef-server-ctl

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](redis/redis-rb@v4.5.1...v4.6.0)

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

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

src/chef-server-ctl/Gemfile.lock

@@ -271,7 +271,7 @@ GEM
     rainbow (3.1.1)
     rake (13.0.6)
     rb-readline (0.5.5)
-    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)