Bump json from 2.6.1 to 2.6.2

Bumps [json](https://github.com/flori/json) from 2.6.1 to 2.6.2.
- [Release notes](https://github.com/flori/json/releases)
- [Changelog](https://github.com/flori/json/blob/master/CHANGES.md)
- [Commits](ruby/json@v2.6.1...v2.6.2)

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

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

Author: dependabot[bot]

Gemfile.lock

@@ -10,7 +10,7 @@ GEM
   remote: https://rubygems.org/
   specs:
     docile (1.4.0)
-    json (2.6.1)
+    json (2.6.2)
     minitest (5.15.0)
     prettier_print (0.1.0)
     rake (13.0.6)