ssh-server: Do not overwrite sshd_config on Debian ≥ bookworm

Configure everything via drop-ins to reduce config file noise.  It is expected
to revert the main sshd_config to distribution defaults when upgrading to
bookworm.

ssh-server/tasks/main.yml

@@ -31,7 +31,9 @@
     mode: '0644'
     backup: true
     validate: '/usr/sbin/sshd -t -f %s'
-  when: ansible_distribution_major_version|int(default=99) > 10
+  when:
+    - ansible_distribution_major_version|int(default=99) > 10
+    - ansible_distribution_major_version|int(default=99) < 12
   notify:
     - restart sshd
   tags: