Add rocky-el9 configuration to manifest #93

Job	Run time
prebuild	1m 8s
build (ubuntu, ubuntu-jammy, ci.cr.45d.io/ci/zfs/ubuntu-jammy:1)	6s
build (rocky, rocky-el9, ci.cr.45d.io/ci/zfs/rocky-el9:1)	8s
build (ubuntu, ubuntu-focal, ci.cr.45d.io/ci/zfs/ubuntu-focal:1)	5s
build (rocky, rocky-el8, ci.cr.45d.io/ci/zfs/rocky-el8:1)	6s
sign	0s
update_repositories	0s
sync_repositories	0s
prebuild	38s
build	-1s
update_repositories	0s
sign	0s
sync_repositories	0s
	2m 10s

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