Bump json from 2.0.2 to 2.3.1

Bumps [json](https://github.com/flori/json) from 2.0.2 to 2.3.1.
- [Release notes](https://github.com/flori/json/releases)
- [Changelog](https://github.com/flori/json/blob/master/CHANGES.md)
- [Commits](ruby/json@v2.0.2...v2.3.1)

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

Author: dependabot[bot]

Gemfile.lock

@@ -850,7 +850,7 @@ GEM
       thor (>= 0.14, < 2.0)
     jquery-ui-rails (6.0.1)
       railties (>= 3.2.16)
-    json (2.0.2)
+    json (2.3.1)
     jsonapi-renderer (0.2.0)
     kaminari (1.1.1)
       activesupport (>= 4.1.0)