support ruby 3

Signed-off-by: kasif <[email protected]>

.expeditor/verify.pipeline.yml

@@ -1,33 +1,25 @@
 steps:
 
-- label: run-specs-ruby-2.3
+- label: run-specs-ruby-2.7
   command:
     - .expeditor/run_linux_tests.sh "rake"
   expeditor:
     executor:
       docker:
-        image: ruby:2.3
+        image: ruby:2.7
 
-- label: run-specs-ruby-2.4
+- label: run-specs-ruby-3.0
   command:
     - .expeditor/run_linux_tests.sh "rake"
   expeditor:
     executor:
       docker:
-        image: ruby:2.4-buster
+        image: ruby:3.0
 
-- label: run-specs-ruby-2.5
+- label: run-specs-ruby-3.1
   command:
     - .expeditor/run_linux_tests.sh "rake"
   expeditor:
     executor:
       docker:
-        image: ruby:2.5-buster
-
-- label: run-specs-ruby-2.6
-  command:
-    - .expeditor/run_linux_tests.sh "rake"
-  expeditor:
-    executor:
-      docker:
-        image: ruby:2.6-buster
+        image: ruby:3.1

Gemfile

@@ -3,3 +3,4 @@ gemspec name: 'stove'
 
 # testing compatibility
 gem 'rack', '< 2'
+gem 'webrick'

stove.gemspec

@@ -18,7 +18,7 @@ Gem::Specification.new do |spec|
   spec.executables   = 'stove'
   spec.require_paths = ['lib']
 
-  spec.required_ruby_version = '>= 2.3'
+  spec.required_ruby_version = '>= 2.7'
 
   # Runtime dependencies
   spec.add_dependency 'chef-api', '~> 0.5'