CI: bump Fedora to current supported versions #6

Job	Run time
static / cppcheck	14s
tests / cmake	50s
tests / makefile	52s
static / formatcheck	17s
tests / cmake (-DGUEST_BACKEND=0)	46s
tests / makefile (GUEST_BACKEND=0)	44s
tests / cmake (-DHOST_BACKEND=0)	27s
tests / makefile (HOST_BACKEND=0)	22s
staticbuild (x86_64)	15s
rpmbuild (x86_64, almalinux:8)	33s
staticbuild (ppc64le)	1m 29s
rpmbuild (x86_64, almalinux:9)	37s
rpmbuild (x86_64, fedora:39)	1m 19s
rpmbuild (x86_64, fedora:40)	35s
rpmbuild (x86_64, fedora:rawhide)	33s
rpmbuild (x86_64, opensuse/leap:15)	58s
rpmbuild (x86_64, opensuse/tumbleweed:latest)	42s
rpmbuild (ppc64le, almalinux:8)	6m 13s
rpmbuild (ppc64le, almalinux:9)	4m 19s
rpmbuild (ppc64le, fedora:39)	7m 3s
rpmbuild (ppc64le, fedora:40)	3m 59s
rpmbuild (ppc64le, fedora:rawhide)	3m 10s
rpmbuild (ppc64le, opensuse/leap:15)	4m 31s
rpmbuild (ppc64le, opensuse/tumbleweed:latest)	3m 42s
release	4s
	44m 34s

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