Error when deploying customers.gitlab.com

I'm getting this error when trying to deploy the customers app through `sudo chef-client`:

```
================================================================================                                                                 
Recipe Compile Error in /var/chef/cache/cookbooks/gitlab-server/recipes/rsyslog_client.rb                                                        
================================================================================                                                                 
                                                                                                                                                 
ChefVault::Exceptions::SecretDecryption                                                                                                          
---------------------------------------                                                                                                          
syslog_client/_default is not encrypted with your public key.  Contact an administrator of the vault item to encrypt for you!                    
                                                                                                                                                 
Cookbook Trace:                                                                                                                                  
---------------                                                                                                                                  
  /var/chef/cache/cookbooks/gitlab_secrets/libraries/secrets.rb:17:in `get'                                                                      
  /var/chef/cache/cookbooks/gitlab_secrets/libraries/secrets.rb:87:in `get_secrets'                                                              
  /var/chef/cache/cookbooks/gitlab-server/recipes/rsyslog_client.rb:2:in `from_file'                                                             
                                                                                                                                                 
Relevant File Content:                                                                                                                           
----------------------                                                                                                                           
/var/chef/cache/cookbooks/gitlab_secrets/libraries/secrets.rb:                                                                                   
                                                                                                                                                 
 10:        @node = node                                                                                                                         
 11:        Chef::Log.info("gitlab_secrets: BE: 'chef_vault', path: '#{@path}', key:'#{@key}'")                                                  
 12:      end
 13:
 14:      def get
 15:        require 'chef-vault'
 16:        if ChefVault::Item.vault?(@path, @key)
 17>>         Hash(ChefVault::Item.load(@path, @key))
 18:        else
 19:          Chef::Log.warn("This is not a vault, will try to load the #{@key} in the #{@path} databag.")                                      
 20:          Hash(Chef::DataBagItem.load(@path, @key))
 21:        end
 22:      end
 23:    end
```

@skarbek maybe it's related to some recent changes in the vault?

Story points: 1.0