Bump json from 2.1.0 to 2.3.0

Bumps [json](https://github.com/flori/json) from 2.1.0 to 2.3.0.
- [Release notes](https://github.com/flori/json/releases)
- [Changelog](https://github.com/flori/json/blob/master/CHANGES.md)
- [Commits](flori/json@v2.1.0...v2.3.0)

Signed-off-by: dependabot[bot] <support@github.com>

Gemfile

@@ -36,7 +36,7 @@ gem 'jbuilder', '2.7.0'
 gem 'jbuilder_cache_multi', '0.1.0'
 # Use jquery as the JavaScript library
 gem 'jquery-rails', '4.3.1'
-gem 'json', '2.1.0'
+gem 'json', '2.3.0'
 # Faster JavaScript/JSON converter
 gem 'oj', '3.3.9'
 # Use Postgres as the database for Active Record

Gemfile.lock

@@ -127,7 +127,7 @@ GEM
       rails-dom-testing (>= 1, < 3)
       railties (>= 4.2.0)
       thor (>= 0.14, < 2.0)
-    json (2.1.0)
+    json (2.3.0)
     loofah (2.3.1)
       crass (~> 1.0.2)
       nokogiri (>= 1.5.9)
@@ -315,7 +315,7 @@ DEPENDENCIES
   jbuilder (= 2.7.0)
   jbuilder_cache_multi (= 0.1.0)
   jquery-rails (= 4.3.1)
-  json (= 2.1.0)
+  json (= 2.3.0)
   minitest (= 5.10.3, != 5.10.2)
   newrelic_rpm (~> 5.4, >= 5.4.0.347)
   oj (= 3.3.9)