Add PHP version for Debian Bookworm

vars/main.yml

-php_version: "{% if ansible_distribution_release  == 'stretch' %}7.0{% elif ansible_distribution_release  == 'buster' %}7.3{% elif ansible_distribution_release == 'bullseye' %}7.4{% endif %}"
+php_version: "{% if ansible_distribution_release  == 'stretch' %}7.0{% elif ansible_distribution_release  == 'buster' %}7.3{% elif ansible_distribution_release == 'bullseye' %}7.4{% elif ansible_distribution_release == 'bookworm' %}8.2{% endif %}"