Bump json from 1.8.6 to 2.3.0 in /app/ruby/app-issue-creator

Bumps [json](https://github.com/flori/json) from 1.8.6 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@v1.8.6...v2.3.0)

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

Author: dependabot[bot]

app/ruby/app-issue-creator/Gemfile

@@ -1,7 +1,7 @@
 source "https://rubygems.org"
 
 gem "activesupport", "~> 6.0"
-gem "json",        "~> 1.8"
+gem "json",        "~> 2.3"
 gem "jwt"
 gem "octokit"
 gem "sinatra",     "~> 1.3.5"

app/ruby/app-issue-creator/Gemfile.lock

@@ -14,7 +14,7 @@ GEM
       multipart-post (>= 1.2, < 3)
     i18n (1.12.0)
       concurrent-ruby (~> 1.0)
-    json (1.8.6)
+    json (2.3.0)
     jwt (1.5.6)
     minitest (5.17.0)
     multipart-post (2.0.0)
@@ -42,7 +42,7 @@ PLATFORMS
 
 DEPENDENCIES
   activesupport (~> 6.0)
-  json (~> 1.8)
+  json (~> 2.3)
   jwt
   octokit
   sinatra (~> 1.3.5)