Remove oj and its initializer and add json to the Gemfile (#37752)

Gemfile

@@ -67,7 +67,6 @@ gem 'mario-redis-lock', '~> 1.2', require: 'redis_lock'
 gem 'mime-types', '~> 3.7.0', require: 'mime/types/columnar'
 gem 'mutex_m'
 gem 'nokogiri', '~> 1.15'
-gem 'oj', '~> 3.14'
 gem 'ox', '~> 2.14'
 gem 'parslet'
 gem 'premailer-rails'
@@ -96,6 +95,7 @@ gem 'tzinfo-data', '~> 1.2023'
 gem 'webauthn', '~> 3.0'
 gem 'webpush', github: 'mastodon/webpush', ref: '9631ac63045cfabddacc69fc06e919b4c13eb913'
 
+gem 'json'
 gem 'json-ld'
 gem 'json-ld-preloaded', '~> 3.2'
 gem 'rdf-normalize', '~> 0.5'

Gemfile.lock

@@ -473,9 +473,6 @@ GEM
     nokogiri (1.19.1)
       mini_portile2 (~> 2.8.2)
       racc (~> 1.4)
-    oj (3.16.16)
-      bigdecimal (>= 3.0)
-      ostruct (>= 0.2)
     omniauth (2.1.4)
       hashie (>= 3.4.6)
       logger
@@ -997,6 +994,7 @@ DEPENDENCIES
   inline_svg
   irb (~> 1.8)
   jd-paperclip-azure (~> 3.0)
+  json
   json-ld
   json-ld-preloaded (~> 3.2)
   json-schema (~> 6.0)
@@ -1015,7 +1013,6 @@ DEPENDENCIES
   net-http (~> 0.6.0)
   net-ldap (~> 0.18)
   nokogiri (~> 1.15)
-  oj (~> 3.14)
   omniauth (~> 2.0)
   omniauth-cas (~> 3.0.0.beta.1)
   omniauth-rails_csrf_protection (~> 2.0)

config/initializers/oj.rb

@@ -1,3 +0,0 @@
-# frozen_string_literal: true
-
-Oj.default_options = { mode: :compat, time_format: :ruby, use_to_json: true }