build(deps): bump json from 2.10.1 to 2.10.2 in /example

Bumps [json](https://github.com/ruby/json) from 2.10.1 to 2.10.2.
- [Release notes](https://github.com/ruby/json/releases)
- [Changelog](https://github.com/ruby/json/blob/master/CHANGES.md)
- [Commits](ruby/json@v2.10.1...v2.10.2)

---
updated-dependencies:
- dependency-name: json
  dependency-type: indirect
...

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

Author: dependabot[bot]

example/Gemfile.lock

@@ -80,7 +80,7 @@ GEM
       mutex_m
     i18n (1.14.7)
       concurrent-ruby (~> 1.0)
-    json (2.10.1)
+    json (2.10.2)
     logger (1.6.6)
     minitest (5.25.4)
     molinillo (0.8.0)