Add share_with_group_lock to CE optional params block

lib/api/groups.rb

@@ -10,6 +10,7 @@ module API
         optional :visibility, type: String, values: Gitlab::VisibilityLevel.string_values, desc: 'The visibility of the group'
         optional :lfs_enabled, type: Boolean, desc: 'Enable/disable LFS for the projects in this group'
         optional :request_access_enabled, type: Boolean, desc: 'Allow users to request member access'
+        optional :share_with_group_lock, type: Boolean, desc: 'Prevent sharing a project with another group within this group'
       end
 
       params :optional_params do