tests

tests: Drop EOL CentOS 8, add CentOS 10 #399

Job	Run time
arch (armv7)	4m 30s
lint	1m 3s
arch (s390x)	5m 53s
venv	3m 34s
OS (docker.io/debian:stable)	36s
OS (docker.io/debian:unstable)	39s
OS (docker.io/ubuntu:devel)	31s
OS (docker.io/ubuntu:rolling)	1m 11s
OS (docker.io/ubuntu:latest)	31s
OS (registry.fedoraproject.org/fedora:rawhide)	2m 51s
OS (quay.io/centos/centos:stream9)	4m 1s
OS (quay.io/centos/centos:stream10)	16s
	25m 36s

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