fix: bump tk dep <5 (#652)

Signed-off-by: Corey Hemminger <hemminger@hotmail.com>

Author: Stromweld

kitchen-ec2.gemspec

@@ -22,5 +22,5 @@ Gem::Specification.new do |gem|
   gem.add_dependency "aws-sdk-ssm", "~> 1.0"
   gem.add_dependency "retryable", ">= 2.0", "< 4.0" # 4.0 will need to be validated
   gem.add_dependency "sshkey", "~> 2.0"
-  gem.add_dependency "test-kitchen", ">= 3.9.0", "< 4"
+  gem.add_dependency "test-kitchen", ">= 3.9.0", "< 5"
 end