reduce ubuntu version for pack #874

Job	Run time
pack_pip	11s
pack_deb	4m 50s
pack_rpm (fedora, 34)	1m 13s
pack_rpm (fedora, 35)	1m 4s
pack_rpm (fedora, 36)	1m 12s
run_tests_pip_package_linux	2m 37s
run_tests_pip_package_windows	7m 25s
run_tests_rpm (fedora, 34)	4m 41s
run_tests_rpm (fedora, 35)	4m 38s
run_tests_rpm (fedora, 36)	5m 12s
run_tests_deb (ubuntu, focal)	3m 7s
run_tests_deb (ubuntu, jammy)	3m 25s
run_tests_deb (debian, buster)	54s
run_tests_deb (debian, bullseye)	46s
publish_rpm	0s
publish_pip	0s
publish_deb	0s
	41m 15s

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