v6.0.0

• Breaking Internal webservice calls now use Node's built-in fetch instead of http. This
  will affect users who are on unsupported versions of Node, specifically Node 17 and below.
• Two new error codes have been added: NETWORK_TIMEOUT and FETCH_ERROR, second of which is returned
  when there's a fetch related error that could not be handled by other errors.
• The ip6addr dependency has been removed.
• metroCode on LocationRecord has been marked deprecated. The code values
  are no longer being updated.