Don't depend on leap-keymanager anymore

leap-mx is now independent of leap-keymanager and
we can remove this dependency now.

see leap_mx#8558

puppet/modules/leap_mx/manifests/init.pp

@@ -94,15 +94,11 @@ class leap_mx {
   # LEAP-MX CODE AND DEPENDENCIES
   #
 
-  package {
-    $sources['leap-mx']['package']:
+  package { $sources['leap-mx']['package']:
     ensure  => $sources['leap-mx']['revision'],
     require => [
       Class['site_apt::leap_repo'],
       User['leap-mx'] ];
-
-    'leap-keymanager':
-      ensure => latest;
   }
 
   #