TT#87953 jjb: enable Ubuntu focal builds for kamailio 5.4
TT#87953 jjb: enable Ubuntu focal builds for kamailio 5.4

Related to https://github.com/kamailio/kamailio/issues/2338

Change-Id: I1a15d6891e28ca2a5d1a22348966efe322142cee

sipwise/kamailio-deb-jenkins,sipwise/kamailio-deb-jenkins