Bump json-schema from 4.2.0 to 4.3.0

Bumps [json-schema](https://github.com/voxpupuli/json-schema) from 4.2.0 to 4.3.0.
- [Changelog](https://github.com/voxpupuli/json-schema/blob/master/CHANGELOG.md)
- [Commits](voxpupuli/json-schema@v4.2.0...v4.3.0)

---
updated-dependencies:
- dependency-name: json-schema
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Gemfile.lock

@@ -78,7 +78,7 @@ GEM
     jekyll-watch (2.2.1)
       listen (~> 3.0)
     json (2.7.1)
-    json-schema (4.2.0)
+    json-schema (4.3.0)
       addressable (>= 2.8)
     kramdown (2.4.0)
       rexml