[Maintenance] Update sidekiq to 6.4.1

Maintenance

Change log

• Added:
• Changed: The sidekiq version to avoid the deprecation warning
• Deprecated:
• Removed:
• Fixed:
• Security:

Notes

redis.multi do
  redis.get("key")
end

should be replaced by

redis.multi do |pipeline|
  pipeline.get("key")
end

(called from /usr/local/bundle/gems/sidekiq-6.4.0/lib/sidekiq/launcher.rb:164:in `block in ❤'}