Relax Buildkit version constraint

Co-authored-by: Gio Lodi <giovanni.lodi42@gmail.com>

Author: jkmassel

fastlane-plugin-wpmreleasetoolkit.gemspec

@@ -28,7 +28,7 @@ Gem::Specification.new do |spec|
   spec.add_dependency 'diffy', '~> 3.3'
   spec.add_dependency 'nokogiri', '~> 1.11' # Needed for AndroidLocalizeHelper
   spec.add_dependency 'octokit', '~> 4.18'
-  spec.add_dependency 'buildkit', '~> 1.4.5'
+  spec.add_dependency 'buildkit', '~> 1.4'
 
   spec.add_dependency 'git', '~> 1.3'
   spec.add_dependency 'jsonlint', '~> 0.3'