Fix deprecation warning on MultiJson#load/dump

These are [deprecated] in v1, renamed to `parse`/`generate` to match
stdlib API, and will be removed in v2.

Upstream que has [dropped] `multi_json` entirely, so this does not
affect that transition.

[deprecated]: https://github.com/sferik/multi_json/tree/v1.21.1#deprecated-in-1210
[dropped]: que-rb/que@bdd3c3d

Author: OJFord

Gemfile

@@ -10,6 +10,7 @@ group :development, :test do
   gem 'activerecord',    require: nil
   gem 'connection_pool', require: nil
   gem 'gc_ruboconfig'
+  gem 'multi_json', '~> 1.21', require: nil
   gem 'pg', require: nil, platform: :ruby
   gem 'pg_jruby', require: nil, platform: :jruby
   gem 'pond', require: nil

lib/que/adapters/base.rb

@@ -31,7 +31,7 @@ class Base
         # integer
         23 => proc(&:to_i),
         # json
-        114 => ->(value) { JSON_MODULE.load(value, create_additions: false) },
+        114 => ->(value) { JSON_MODULE.parse(value, create_additions: false) },
         # float
         701 => proc(&:to_f),
         # timestamp with time zone
@@ -74,7 +74,7 @@ def execute(command, params = [])
           # The pg gem unfortunately doesn't convert fractions of time instances, so cast
           # them to a string.
           when Time then param.strftime("%Y-%m-%d %H:%M:%S.%6N %z")
-          when Array, Hash then JSON_MODULE.dump(param)
+          when Array, Hash then JSON_MODULE.generate(param)
           else param
           end
         end