Bump json from 2.1.0 to 2.3.0 in /api/ruby/rendering-data-as-graphs

Bumps [json](https://github.com/flori/json) from 2.1.0 to 2.3.0.
- [Release notes](https://github.com/flori/json/releases)
- [Changelog](https://github.com/flori/json/blob/master/CHANGES.md)
- [Commits](ruby/json@v2.1.0...v2.3.0)

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

api/ruby/rendering-data-as-graphs/Gemfile

@@ -1,6 +1,6 @@
 source "https://rubygems.org"
 
-gem "json", "~>2.1.0"
+gem "json", "~>2.3.0"
 gem "octokit", "~>4.7.0"
 gem "sinatra", "~>1.4.8"
 gem "sinatra_auth_github", "~>1.2.0"

api/ruby/rendering-data-as-graphs/Gemfile.lock

@@ -13,7 +13,7 @@ GEM
       multipart-post (>= 1.2, < 3)
     i18n (1.12.0)
       concurrent-ruby (~> 1.0)
-    json (2.1.0)
+    json (2.3.0)
     minitest (5.17.0)
     multipart-post (2.0.0)
     octokit (4.7.0)
@@ -46,7 +46,7 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
-  json (~> 2.1.0)
+  json (~> 2.3.0)
   octokit (~> 4.7.0)
   sinatra (~> 1.4.8)
   sinatra_auth_github (~> 1.2.0)