ci: add test for python 3.12 #774

Job	Run time
Test hadoop backend	2m 13s
Test k8s backend & chart (v1.24, default)	5m 57s
Test k8s backend & chart (v1.25, separate-namespace)	6m 0s
main-tests (3.9, 1.20)	2m 22s
Test pbs backend	1m 38s
Test k8s backend & chart (v1.26, default, 2022.4.0)	6m 17s
main-tests (3.10, 1.21)	2m 24s
Test slurm backend	1m 33s
Test k8s backend & chart (v1.27, default)	5m 56s
main-tests (3.11, 1.21)	2m 33s
Test k8s backend & chart (v1.28, default)	5m 51s
main-tests (3.12, 1.21)	22s
	43m 6s

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