Don't use releasever to peg Rocky Linux 9 #109

Job	Run time
build (centos, 7, centos-7, centos-7/Containerfile)	7m 11s
build (rockylinux, 8, rockylinux-8, rockylinux-8/Containerfile)	20s
build (rockylinux, 8.6, rockylinux-8, rockylinux-8/Containerfile-8.6)	7m 4s
build (rockylinux, 8.7, rockylinux-8, rockylinux-8/Containerfile-8.7)	6m 35s
build (rockylinux, 8.8, rockylinux-8, rockylinux-8/Containerfile-8.8)	8m 1s
build (rockylinux, 8.9, rockylinux-8, rockylinux-8/Containerfile-8.9)	5m 34s
build (rockylinux, 9, rockylinux-9, rockylinux-9/Containerfile)	6m 20s
build (rockylinux, 9.0, rockylinux-9, rockylinux-9/Containerfile-9.0)	14s
build (rockylinux, 9.1, rockylinux-9, rockylinux-9/Containerfile-9.1)	14s
build (rockylinux, 9.2, rockylinux-9, rockylinux-9/Containerfile-9.2)	34s
build (rockylinux, 9.3, rockylinux-9, rockylinux-9/Containerfile-9.3)	6m 36s
build (leap, 15, leap, leap/Containerfile.15)	7m 2s
build (leap, latest, leap, leap/Containerfile)	9m 4s
build (debian, 12.0, debian, debian/Containerfile-12.0)	7m 3s
	1h 11m 52s

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