Update redis dependency in order to remove test code

[shanemvh]

This fix redis/redis-rb@7fd6544 in redis-rb removed the test code from the gem. Test code in gems causes compliance issues in many code and security scanners. The tests for redis-rb also include some private key files that get falsely flagged as a security vulnerability. Can you update to a version of redis-rb that includes this fix? Thanks

[Nate Wiger]

The dependencies for redis-objects should be >= the minimum version required. We don't want to forcibly require the latest version of redis-rb because there may be other compatibility issues we don't know about. I would recommend you just require the latest redis-rb in your Gemfile.