Updated to Drupal 8.6.4, which is PHP 7.3 friendly. Also updated HTMLaw library....

[yaffs-website] / web / core / modules / user / config / install / user.role.anonymous.yml

langcode: en
status: true
dependencies: {  }
id: anonymous
label: 'Anonymous user'
weight: 0
is_admin: false
permissions: {  }