chore(deps): bump json from 2.15.1 to 2.15.2.1 in /example (#1464)

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Author: dependabot[bot]

example/Gemfile.lock

@@ -89,7 +89,7 @@ GEM
       mutex_m
     i18n (1.14.7)
       concurrent-ruby (~> 1.0)
-    json (2.15.1)
+    json (2.15.2.1)
     logger (1.7.0)
     minitest (5.26.0)
     molinillo (0.8.0)