"unintialized constant Redis::NoScript" error with 5.4.1

[rohitpaulk]

Ran into this error when upgrading to 5.4.1, seems related to #1311 (cc: @byroot)

bundler: failed to load command: resque-scheduler (/usr/local/bundle/bin/resque-scheduler)
/usr/local/bundle/gems/redis-5.4.1/lib/redis/client.rb:19:in `<class:Client>': uninitialized constant Redis::NoScriptError (NameError)
 
       ERROR_MAPPING[RedisClient::NoScriptError] = Redis::NoScriptError
                                                        ^^^^^^^^^^^^^^^
 	from /usr/local/bundle/gems/redis-5.4.1/lib/redis/client.rb:4:in `<class:Redis>'
 	from /usr/local/bundle/gems/redis-5.4.1/lib/redis/client.rb:3:in `<top (required)>'

Downgrading to 5.4.0 fixes this.

Can help with a proper repro if needed sometime next week - short on time now so just opening this early!