Merge pull request #519 from alphagov/dependabot/bundler/json-2.12.0

Bump json from 2.11.3 to 2.12.0

Author: owenatgov

Gemfile.lock

@@ -84,7 +84,7 @@ GEM
     http_parser.rb (0.8.0)
     i18n (1.6.0)
       concurrent-ruby (~> 1.0)
-    json (2.11.3)
+    json (2.12.0)
     kramdown (2.5.1)
       rexml (>= 3.3.9)
     language_server-protocol (3.17.0.4)