Update jenkins-slave-docker to Jammy LTS

Canonical has published Ubuntu 22.04 LTS (Jammy Jellyfish) on 21 April 2022.

https://github.com/folio-org/folio-tools/tree/master/jenkins-slave-docker = Docker image folioci/jenkins-slave-all is based on ubuntu:focal, the previous LTS version.

Ubuntu doesn't fix all security issues in Focal: https://snyk.io/test/docker/ubuntu%3A20.04

To keep our CI pipeline secure an increasingly amount of work is needed to back-port security fixes if we stay with Focal.

Therefore we should switch to Jammy. This will allow to switch from manually installed packages to Ubuntu packages making maintenance more easy.