Update metadata for 12.4.0

Author: kitchen-porter

metadata.rb

@@ -3,7 +3,7 @@
 maintainer_email  '[email protected]'
 license           'Apache-2.0'
 description       'Installs and configures haproxy'
-version           '12.3.7'
+version           '12.4.0'
 source_url        'https://github.com/sous-chefs/haproxy'
 issues_url        'https://github.com/sous-chefs/haproxy/issues'
 chef_version      '>= 16'