Bullseye Compatibility for networkd

Adapt the Debian version safeguard, so that is evaluated on testing as higher than any released version.

networkd/templates/20-wired-routed.network.j2

@@ -23,7 +23,7 @@ IPForward=yes
 Gateway={{ route.gateway }}
 {% endif %}
 {% if route.gateway_on_link is defined %}
-{% if ansible_distribution_major_version|int <= 10 %}
+{% if ansible_distribution_major_version|int(default=99) < 11 %}
 GatewayOnlink={{ route.gateway_on_link }}
 {% else %}
 GatewayOnLink={{ route.gateway_on_link }}