Ruby 2.7 deprecation warning with ActiveSupport(v6.1.0) RedisCacheStore

[fukayatsu]

Steps to Reproduce

1. Start redis
   • e.g. docker run -p 6379:6379 redis
2. Run below script on ruby 2.7.2

   # rack_attack_debug.rb
   
   require 'bundler/inline'
   
   gemfile do
     source 'https://rubygems.org'
     gem 'activesupport', '6.1.0'
     gem 'rack-attack', '6.3.1'
     gem 'redis', '4.2.5'
   end
   
   Warning[:deprecated] = true
   
   require 'active_support'
   require 'active_support/cache/redis_cache_store'
   Rack::Attack.cache.store = ActiveSupport::Cache::RedisCacheStore.new
   
   key = 'rack_attack_debug'
   Rack::Attack.cache.store.delete(key)
   
   # https://github.com/rack/rack-attack/blob/v6.3.1/lib/rack/attack/store_proxy/redis_cache_store_proxy.rb#L13
   Rack::Attack.cache.store.increment(key, 1, expires_in: 30) #=> RedisCacheStore#write with expires_in
   Rack::Attack.cache.store.increment(key, 1, expires_in: 30) #=> RedisCacheStore#increment
   puts "#{key}: #{Rack::Attack.cache.store.read(key)}"

Expected

$ ruby -v
ruby 2.7.2p137 (2020-10-01 revision 5445e04352) [x86_64-darwin19]

$ ruby rack_attack_debug.rb
rack_attack_debug: 2

Actual

$ ruby -v
ruby 2.7.2p137 (2020-10-01 revision 5445e04352) [x86_64-darwin19]

$ ruby rack_attack_debug.rb
/Users/fukayatsu/.rbenv/versions/2.7.2/lib/ruby/2.7.0/delegate.rb:83: warning: Using the last argument as keyword parameters is deprecated; maybe ** should be added to the call
/Users/fukayatsu/.rbenv/versions/2.7.2/lib/ruby/gems/2.7.0/gems/activesupport-6.1.0/lib/active_support/cache/strategy/local_cache.rb:116: warning: The called method `increment' is defined here
rack_attack_debug: 2