Add new images for PHP 8.4

[robertragas]

Add images with PHP 8.4 support

1. Drupal 10 + PHP 8.4
New images use drupal:10.6.3-php8.4

• CI: drupal10/ci-php8.4 and drupal10/ci-php8.4-v2 (v2 includes Kafka/rdkafka).
• Dev: drupal10/php8.4 and drupal10/php8.4-v2 with Xdebug 3.4.x, GMP, intl, Redis (and rdkafka in v2).

2. Drupal 11 + PHP 8.4
New images use drupal:11.3.3-php8.4:

• CI: drupal11/ci-php8.4 and drupal11/ci-php8.4-v2 (v2 includes Kafka).
• Dev: drupal11/php8.4 and drupal11/php8.4-v2 with Xdebug 3.4.x, GMP, intl, Redis (v2 also includes rdkafka).

3. Composer installer:
New PHP 8.4 images verify the installer using the dynamic sig from composer.github.io/installer.sig instead of a hardcoded hash.

HTT

1. Build the tag locally by going to the folder eg. drupal10/php8.4-v2/ and run
   docker buildx build --platform linux/arm64 --load -t goalgorilla/open_social_docker:drupal10-php8.4-v2 .
2. In cablecar composer.yaml change the tag to goalgorilla/open_social_docker:drupal10-php8.4-v2
3. Run the container and see the php version upgraded.