attendedsysupgrade-common: update server URL

The service is now on a new server which supports IPv6.

Signed-off-by: Paul Spooren <mail@aparcar.org>

utils/attendedsysupgrade-common/files/attendedsysupgrade.defaults

@@ -6,7 +6,7 @@ touch /etc/config/attendedsysupgrade
 
 uci -q batch <<EOF
 set attendedsysupgrade.server=server
-set attendedsysupgrade.server.url='https://chef.libremesh.org'
+set attendedsysupgrade.server.url='https://asu.aparcar.org'
 
 set attendedsysupgrade.client=client
 set attendedsysupgrade.client.upgrade_packages='1'