Bump json from 2.2.0 to 2.3.0

Bumps [json](https://github.com/flori/json) from 2.2.0 to 2.3.0.
- [Release notes](https://github.com/flori/json/releases)
- [Changelog](https://github.com/flori/json/blob/master/CHANGES.md)
- [Commits](https://github.com/flori/json/compare/v2.2.0...v2.3.0)

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

Gemfile.lock

@@ -56,7 +56,7 @@ GEM
       gemoji (~> 3.0)
       html-pipeline (~> 2.2)
       jekyll (>= 3.0, < 5.0)
-    json (2.2.0)
+    json (2.3.0)
     kramdown (2.1.0)
     kramdown-parser-gfm (1.1.0)
       kramdown (~> 2.0)