Require Ruby 2.6 or newer

Author: bastelfreak

.github/workflows/unit_tests.yaml

@@ -18,7 +18,7 @@ jobs:
     strategy:
       matrix:
         ruby:
-          - '2.5'
+          - '2.6'
           - '2.7'
           - '3.0'
           - '3.2'

.rubocop.yml

@@ -2,7 +2,7 @@
 inherit_from: .rubocop_todo.yml
 
 AllCops:
-  TargetRubyVersion: 2.5
+  TargetRubyVersion: 2.6
   Exclude:
     - acceptance/**/*
     - vendor/**/*

facter.gemspec

@@ -24,7 +24,7 @@ Gem::Specification.new do |spec|
   base = "#{__dir__}#{File::SEPARATOR}"
   spec.files = dirs.map { |path| path.sub(base, '') }
 
-  spec.required_ruby_version = '>= 2.5', '< 4.0'
+  spec.required_ruby_version = '>= 2.6', '< 4.0'
   spec.bindir = 'bin'
   spec.executables   = spec.files.grep(%r{^bin/}) { |f| File.basename(f) }
   spec.require_paths = ['lib']
@@ -38,14 +38,14 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'ffi', '>= 1.15.5', '< 1.17.0', '!= 1.16.0', '!= 1.16.1', '!= 1.16.2'
   spec.add_development_dependency 'rake', '~> 13.0', '>= 13.0.6'
   spec.add_development_dependency 'rspec', '~> 3.0'
-  spec.add_development_dependency 'rubocop', '~> 1.28' # last version to support 2.5
+  spec.add_development_dependency 'rubocop', '~> 1.50.0' # last version to support 2.6
   spec.add_development_dependency 'rubocop-performance', '~> 1.5.2'
-  spec.add_development_dependency 'rubocop-rspec', '~> 2.10' # last version to support 2.5
+  spec.add_development_dependency 'rubocop-rspec', '~> 2.20.0' # last version to support 2.6
   spec.add_development_dependency 'simplecov', '~> 0.17.1'
   spec.add_development_dependency 'sys-filesystem', '~> 1.4'
   spec.add_development_dependency 'webmock', '~> 3.12'
   spec.add_development_dependency 'yard', '~> 0.9'
 
   spec.add_runtime_dependency 'hocon', '~> 1.3'
-  spec.add_runtime_dependency 'thor', ['>= 1.0.1', '< 1.3'] # Thor 1.3.0 drops support for Ruby 2.5
+  spec.add_runtime_dependency 'thor', '~> 1.0'
 end