Remove kaminari-activerecord from solidus_core

All transient gems that actually use Kaminari for pagination have it
as dependency and this is the right call. Depending on kaminari in
core does not make any sense, since core does not hold controllers
nor views.

Author: tvdeyen

api/lib/spree/api.rb

@@ -1,5 +1,6 @@
 # frozen_string_literal: true
 
+require "kaminari/activerecord"
 require "spree/core"
 
 require "spree/api/engine"

core/lib/spree/core.rb

@@ -16,7 +16,6 @@
 require "awesome_nested_set"
 require "cancan"
 require "friendly_id"
-require "kaminari/activerecord"
 require "monetize"
 require "paperclip"
 require "ransack"

core/lib/spree/core/search/base.rb

@@ -1,5 +1,7 @@
 # frozen_string_literal: true
 
+require "kaminari/activerecord"
+
 module Spree
   module Core
     module Search

core/solidus_core.gemspec

@@ -42,7 +42,6 @@ Gem::Specification.new do |s|
   s.add_dependency "discard", "~> 1.0"
   s.add_dependency "friendly_id", "~> 5.0"
   s.add_dependency "image_processing", "~> 1.10"
-  s.add_dependency "kaminari-activerecord", "~> 1.1"
   s.add_dependency "mini_magick", "~> 4.10"
   s.add_dependency "monetize", "~> 1.8"
   s.add_dependency "kt-paperclip", [">= 6.3", "< 8"]