readme: remove qemu set up workaround #936

Job	Run time
channel (ubuntu-latest)	22s
context (ubuntu-latest)	19s
channel (macos-13)	11m 58s
daemon-config (ubuntu-latest)	19s
context (macos-13)	6m 48s
channel (windows-latest)	33s
daemon-config (macos-13)	10m 29s
lima-start-args	5m 18s
context (windows-latest)	29s
main (ubuntu-latest, v27.3.1)	21s
daemon-config (windows-latest)	38s
build-linux (containerd-system)	36s
main (ubuntu-latest, type=image,tag=27.3.1)	24s
build-linux (containerd-tarball)	40s
main (macos-13, v27.3.1)	7m 18s
build-macos (macos-13)	19m 49s
main (macos-13, type=image,tag=27.3.1)	6m 23s
main (windows-latest, v27.3.1)	53s
main (windows-latest, type=image,tag=27.3.1)	39s
build-windows	55s
rootless	20s
set-host	18s
	1h 15m 49s

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