task: Require Drupal ~12

Rajab Natshahrequested to merge
issue/website_starter-3622684:3622684-drupal-12 into 1.0.x

Requires Drupal ~12 on 1.0.x: drupal/core: ~12 in composer.json.

Closes https://www.drupal.org/project/website_starter/issues/3622684

AI-Generated: Yes

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