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iwyu.yml: added jobs with latest IWYU [skip ci] #569

Job	Run time
iwyu (ubuntu-22.04, fedora:rawhide, libstdc++)	7m 9s
iwyu (ubuntu-22.04, fedora:rawhide, libc++)	6m 53s
iwyu (macos-26, libc++, -Xiwyu --mapping_file=$(realpath ./macos.imp))	5m 30s
iwyu (ubuntu-22.04, libc++, -isystem/usr/lib/clang/23/include, true)	7m 21s
iwyu (ubuntu-22.04, libstdc++, true)	9m 40s
iwyu (ubuntu-22.04, libc++, -isystem/usr/lib/clang/23/include, true)	8m 45s
iwyu (ubuntu-22.04, fedora:rawhide, libc++)	8m 9s
iwyu (macos-26, libc++, -Xiwyu --mapping_file=$(realpath ./macos.imp))	5m 13s
iwyu (ubuntu-22.04, libstdc++, true)	9m 31s
iwyu (ubuntu-22.04, fedora:rawhide, libstdc++)	5m 29s
	1h 13m 40s