Bump json from 2.20.0 to 2.21.2 in the bundler group across 1 directory (#177)

Bumps the bundler group with 1 update in the / directory: [json](https://github.com/ruby/json).


Updates `json` from 2.20.0 to 2.21.2
- [Release notes](https://github.com/ruby/json/releases)
- [Changelog](https://github.com/ruby/json/blob/master/CHANGES.md)
- [Commits](https://github.com/ruby/json/compare/v2.20.0...v2.21.2)

---
updated-dependencies:
- dependency-name: json
  dependency-version: 2.21.2
  dependency-type: indirect
  dependency-group: bundler
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Gemfile.lock

@@ -113,7 +113,7 @@ GEM
       mutex_m
     i18n (1.15.2)
       concurrent-ruby (~> 1.0)
-    json (2.20.0)
+    json (2.21.2)
     kramdown (2.5.2)
       rexml (>= 3.4.4)
     kramdown-parser-gfm (1.1.0)