Merge pull request coderdojo-japan#1662 from coderdojo-japan/dependabot/bundler/json-2.10.2

Bump json from 2.10.1 to 2.10.2

Author: yasulab

Gemfile.lock

@@ -228,7 +228,7 @@ GEM
       rails-dom-testing (>= 1, < 3)
       railties (>= 4.2.0)
       thor (>= 0.14, < 2.0)
-    json (2.10.1)
+    json (2.10.2)
     jwt (2.10.1)
       base64
     koala (3.6.0)