Drupal 11 & PHP 8.4

Update PHP, nginx, Drupal core and dev tooling to current versions (#3)

Bumps php:8.3-fpm-bullseye to php:8.4-fpm-bookworm, nginx to 1.30.4
(stable), Drupal core to 11.4.5, Drush to 13.7.6, and dev dependencies
(coder ^9.0, phpcs ^4.0, phpunit ^11.5) to versions compatible with it.

Co-authored-by: Claude Sonnet 5 <noreply@anthropic.com>