Bump json from 2.6.2 to 2.6.3

Bumps [json](https://github.com/flori/json) from 2.6.2 to 2.6.3.
- [Release notes](https://github.com/flori/json/releases)
- [Changelog](https://github.com/flori/json/blob/master/CHANGES.md)
- [Commits](ruby/json@v2.6.2...v2.6.3)

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

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

Gemfile.lock

@@ -187,7 +187,7 @@ GEM
     ice_cube (0.16.4)
     js_cookie_rails (2.2.0)
       railties (>= 3.1)
-    json (2.6.2)
+    json (2.6.3)
     jwt (2.5.0)
     kaminari (1.2.2)
       activesupport (>= 4.1.0)