Update [Drupal core] from 8.6.7 to 8.6.10

Drupal 8.6.10 is out

https://www.drupal.org/project/drupal/releases/8.6.10

Also Drupal 8.5.11 is out

https://www.drupal.org/project/drupal/releases/8.5.11

Drupal core - Highly critical - Remote Code Execution - SA-CORE-2019-003

https://www.drupal.org/SA-CORE-2019-003

Paragraphs - Critical - Remote Code Execution - SA-CONTRIB-2019-023

https://www.drupal.org/sa-contrib-2019-023
paragraphs 8.x-1.6
https://www.drupal.org/project/paragraphs/releases/8.x-1.6

Metatag - Critical - Remote code execution - SA-CONTRIB-2019-021

https://www.drupal.org/sa-contrib-2019-021
metatag 8.x-1.8
https://www.drupal.org/project/metatag/releases/8.x-1.8