build(deps): bump docker/build-push-action from 5 to 6 #667

Job	Run time
build-macos (macos-13)	8m 33s
build-windows	54s
build-macos (macos-12)	9m 33s
build-linux (containerd-system)	51s
build-linux (containerd-tarball)	52s
channel (ubuntu-latest)	52s
context (ubuntu-latest)	32s
channel (macos-13)	5m 44s
context (macos-13)	7m 46s
daemon-config (ubuntu-latest)	32s
channel (windows-latest)	41s
context (windows-latest)	40s
daemon-config (macos-13)	7m 40s
daemon-config (windows-latest)	39s
lima-start-args	5m 43s
main (ubuntu-latest, pinned)	32s
main (ubuntu-latest, latest)	33s
main (macos-13, pinned)	5m 29s
set-host	33s
main (macos-13, latest)	5m 58s
main (windows-latest, pinned)	27s
main (windows-latest, latest)	39s
	1h 5m 43s

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