chore(deps-dev): bump json from 2.8.2 to 2.9.0

Bumps [json](https://github.com/ruby/json) from 2.8.2 to 2.9.0.
- [Release notes](https://github.com/ruby/json/releases)
- [Changelog](https://github.com/ruby/json/blob/master/CHANGES.md)
- [Commits](ruby/json@v2.8.2...v2.9.0)

---
updated-dependencies:
- dependency-name: json
  dependency-type: indirect
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Gemfile.lock

@@ -144,7 +144,7 @@ GEM
     jbuilder (2.13.0)
       actionview (>= 5.0.0)
       activesupport (>= 5.0.0)
-    json (2.8.2)
+    json (2.9.0)
     kaminari (1.2.2)
       activesupport (>= 4.1.0)
       kaminari-actionview (= 1.2.2)