require a ruby version of at least 3.x

Author: GrantBirki

entitlements-app.gemspec

@@ -14,6 +14,8 @@ Gem::Specification.new do |s|
   s.homepage = "https://github.com/github/entitlements-app"
   s.executables = %w[deploy-entitlements]
 
+  s.required_ruby_version = ">= 3.0.0"
+
   s.add_dependency "concurrent-ruby", "= 1.1.9"
   s.add_dependency "faraday", "> 2.0", "<= 2.7.10"
   s.add_dependency "net-ldap", "~> 0.19"