[apt] Debian Security changed its naming convention since Bullseye

Signed-off-by: Yohann D'ANELLO <ynerant@crans.org>

roles/debian-apt-sources/templates/apt/sources.list.j2

 {{ ansible_header | comment }}
 
 {% if ansible_distribution == "Debian" %}
-{% if ansible_distribution_release != "bullseye" %}
-{# Debian security does not exist yet for bullseye #}
 # Mises à jour de sécurité
+{% if ansible_distribution_major_version|int < 11 %}
+{# Debian security changed its naming convention in Bullseye #}
 deb     {{ debian_mirror }}-security {{ ansible_distribution_release }}/updates {{ debian_components }}
-
+{% else %}
+deb     {{ debian_mirror }}-security {{ ansible_distribution_release }}-security {{ debian_components }}
 {% endif %}
+
 # Dépôt classique
 deb     {{ debian_mirror }} {{ ansible_distribution_release }} {{ debian_components }}