ci: fix ubuntu version to 22.04 #860

Job	Run time
meta	9s
fossa-scan	4m 30s
compliance-copyrights	24s
pre-commit	15s
test-unit 3.7	2m 3s
test-unit 3.8	1m 35s
test-unit 3.9	1m 35s
test-unit 3.10	1m 36s
test-unit 3.11	1m 29s
semgrep / sast-scan	27s
test-splunk (9.3.1, 0b8d769cb912, true, false)	3m 24s
test-splunk (9.2.3, 282efff6aa8b, false, false)	3m 24s
test-splunk (9.1.6, a28f08fac354, false, true)	3m 23s
publish	1m 0s
	25m 14s

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