Update gem dependencies

Author: nadjaheitmann

foreman_kernel_care.gemspec

@@ -15,10 +15,9 @@ Gem::Specification.new do |s|
 
   s.required_ruby_version = '>= 2.5.0'
 
-  s.add_dependency 'foreman_remote_execution', '>= 1.5.6'
-  s.add_dependency 'katello', '>= 4.8.0'
+  s.add_dependency 'foreman_remote_execution', '>= 9.0.0'
+  s.add_dependency 'katello', '>= 4.15.0'
 
   s.add_development_dependency 'rdoc', '~> 6', '>= 6.3.1'
-  s.add_development_dependency 'rubocop', '>= 0.87.0'
-  s.add_development_dependency 'rubocop-rails', '~> 2.8.1'
+  s.add_development_dependency 'theforeman-rubocop', '~> 0.1.0'
 end