Log Message:
www/drupal8: update to 8.9.13

Update drupal8 to 8.9.13 (Drupal 8.9.13).

Fixes these security problems.

8.9.9 (2020-11-18)

Drupal core - Critical - Remote code execution - SA-CORE-2020-012

8.9.10 (2020-11-26)

Drupal core - Critical - Third-party library - SA-CORE-2020-013

8.9.13 (2021-01-20)

Drupal core - Critical - Third-party library - SA-CORE-2021-001

For more information, please refer each release announce.

https://www.drupal.org/project/drupal/releases/8.9.7
https://www.drupal.org/project/drupal/releases/8.9.8
https://www.drupal.org/project/drupal/releases/8.9.9
https://www.drupal.org/project/drupal/releases/8.9.10
https://www.drupal.org/project/drupal/releases/8.9.11
https://www.drupal.org/project/drupal/releases/8.9.12
https://www.drupal.org/project/drupal/releases/8.9.13