Drop Dalli 2 support (#679)

.github/workflows/build.yml

@@ -35,7 +35,6 @@ jobs:
           - rails_6_1
           - rails_6_0
           - dalli3
-          - dalli2
           - redis_5
           - redis_4
           - connection_pool_dalli
@@ -51,13 +50,6 @@ jobs:
           - active_support_6_redis_cache_store_pooled
           - redis_store
         exclude:
-          - gemfile: dalli2
-            ruby: '3.3'
-          - gemfile: dalli2
-            ruby: '3.2'
-          - gemfile: dalli2
-            ruby: '3.1'
-          - gemfile: dalli2
             ruby: '3.0'
           - gemfile: rails_7_0
             ruby: '2.6'

gemfiles/dalli2.gemfile

@@ -1,12 +0,0 @@
-# This file was generated by Appraisal
-
-source "https://rubygems.org"
-
-gem "dalli", "~> 2.0"
-
-group :maintenance, optional: true do
-  gem "bake"
-  gem "bake-gem"
-end
-
-gemspec path: "../"

spec/acceptance/stores/active_support_dalli_store_spec.rb

@@ -1,24 +0,0 @@
-# frozen_string_literal: true
-
-require_relative "../../spec_helper"
-
-should_run =
-  defined?(::Dalli) &&
-  Gem::Version.new(::Dalli::VERSION) < Gem::Version.new("3")
-
-if should_run
-  require_relative "../../support/cache_store_helper"
-  require "active_support/cache/dalli_store"
-
-  describe "ActiveSupport::Cache::DalliStore as a cache backend" do
-    before do
-      Rack::Attack.cache.store = ActiveSupport::Cache::DalliStore.new
-    end
-
-    after do
-      Rack::Attack.cache.store.clear
-    end
-
-    it_works_for_cache_backed_features(fetch_from_store: ->(key) { Rack::Attack.cache.store.fetch(key) })
-  end
-end