Update custom extensions to use open-uri-cached

gems/asciidoctor-foodogsquared-extensions.gemspec

@@ -16,4 +16,5 @@ Gem::Specification.new do |s|
   s.files         = Dir['lib/**/*', '*.gemspec']
 
   s.add_runtime_dependency 'asciidoctor', '~> 2.0'
+  s.add_runtime_dependency 'open-uri-cached', '~> 1.0'
 end

gems/lib/asciidoctor/github-raw-content-include-processor/extension.rb

@@ -3,6 +3,7 @@
 require 'base64'
 require 'json'
 require 'open-uri'
+require 'open-uri/cached'
 require 'uri'
 
 class GitHubRawIncludeProcessor < Asciidoctor::Extensions::IncludeProcessor

gems/lib/asciidoctor/gitlab-raw-content-include-processor/extension.rb

@@ -3,6 +3,7 @@
 require 'base64'
 require 'json'
 require 'open-uri'
+require 'open-uri/cached'
 require 'uri'
 
 class GitLabRawIncludeProcessor < Asciidoctor::Extensions::IncludeProcessor

gems/lib/asciidoctor/swhid-include-processor/extension.rb

@@ -2,6 +2,7 @@
 
 require 'json'
 require 'open-uri'
+require 'open-uri/cached'
 require 'uri'
 
 class SWHIDIncludeProcessor < Asciidoctor::Extensions::IncludeProcessor