Update json requirement from 2.11.2 to 2.11.3

---
updated-dependencies:
- dependency-name: json
  dependency-version: 2.11.3
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Gemfile

@@ -3,7 +3,7 @@ source 'https://rubygems.org'
 gem 'rake', '13.2.1'
 gem 'asciidoctor', '2.0.23'
 
-gem 'json', '2.11.2'
+gem 'json', '2.11.3'
 gem 'awesome_print', '1.9.2'
 
 gem 'asciidoctor-fb2', '0.8.0'