Bump json from 2.6.1 to 2.6.2 in /rails

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] <[email protected]>

Author: dependabot[bot]

rails/Gemfile.lock

@@ -84,7 +84,7 @@ GEM
       activesupport (>= 5.0)
     i18n (1.10.0)
       concurrent-ruby (~> 1.0)
-    json (2.6.1)
+    json (2.6.2)
     listen (3.7.1)
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)