Address rake sec issue

Author: Jonathan Claudius

ssh_scan.gemspec

@@ -39,6 +39,6 @@ Gem::Specification.new do |s|
   s.add_development_dependency('pry', '0.11.3')
   s.add_development_dependency('rspec', '3.7.0')
   s.add_development_dependency('rspec-its', '1.2.0')
-  s.add_development_dependency('rake', '12.3.1')
+  s.add_development_dependency "rake", ">= 12.3.3"
   s.add_development_dependency('rubocop')
 end