Specify Redis gems as required dependencies #154
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We recently came across a Ruby 3 compatibility issue with redis-namespace and MailRoom that required updating to redis-namespace v1.8.x (https://github.com/resque/redis-namespace/blob/master/CHANGELOG.md). Since the gemspec did not specify a version, we have to install the required Redis gems by hand and missed the need for updating.
Adjust tests to support both Redis v4 and v5 gems. Redis v4 may still be needed for Rails 6 compatibility.