Bump json from 1.8.3 to 2.3.0 in /hooks/ruby/configuring-your-server

Bumps [json](https://github.com/flori/json) from 1.8.3 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@v1.8.3...v2.3.0)

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

Author: dependabot[bot]

hooks/ruby/configuring-your-server/Gemfile

@@ -1,4 +1,4 @@
 source "https://rubygems.org"
 
-gem "json",        "~> 1.8"
+gem "json",        "~> 2.3"
 gem "sinatra",     "~> 1.3.5"

hooks/ruby/configuring-your-server/Gemfile.lock

@@ -1,7 +1,7 @@
 GEM
-  remote: http://rubygems.org/
+  remote: https://rubygems.org/
   specs:
-    json (1.8.3)
+    json (2.3.0)
     rack (1.6.13)
     rack-protection (1.5.2)
       rack
@@ -15,7 +15,7 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
-  json (~> 1.8)
+  json (~> 2.3)
   sinatra (~> 1.3.5)
 
 BUNDLED WITH