deb: Dockerfile: use ubuntu:jammy (22.04 LTS)

ubuntu 20.04 reached end of standard support;
https://ubuntu.com/blog/ubuntu-20-04-lts-end-of-life-standard-support-is-coming-to-an-end-heres-how-to-prepare

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

Author: thaJeztah

deb/Dockerfile

@@ -2,7 +2,7 @@
 
 ARG GO_VERSION=1.23.12
 ARG DISTRO=ubuntu
-ARG SUITE=focal
+ARG SUITE=jammy
 
 FROM golang:${GO_VERSION}-bookworm AS golang