update bake-action to v6 #5153

Job	Run time
prepare	1s
test / prepare	2m 30s
test / run (containerd, ./frontend/dockerfile, integration)	5m 10s
test / run (containerd, ./frontend/dockerfile, dockerfile)	12m 48s
test / run (containerd-rootless, ./frontend/dockerfile, integration)	5m 29s
test / run (containerd-rootless, ./frontend/dockerfile, dockerfile)	11m 54s
test / run (containerd-1.6, ./frontend/dockerfile, integration)	11m 47s
test / run (containerd-1.6, ./frontend/dockerfile, dockerfile)	9m 22s
test / run (containerd-1.7, ./frontend/dockerfile, integration)	5m 11s
test / run (containerd-1.7, ./frontend/dockerfile, dockerfile)	11m 26s
test / run (containerd-snapshotter-stargz, ./frontend/dockerfile, integration)	11m 34s
test / run (containerd-snapshotter-stargz, ./frontend/dockerfile, dockerfile)	12m 4s
test / run (oci, ./frontend/dockerfile, integration)	11m 1s
test / run (oci, ./frontend/dockerfile, dockerfile)	11m 14s
test / run (oci-rootless, ./frontend/dockerfile, integration)	4m 45s
test / run (oci-rootless, ./frontend/dockerfile, dockerfile)	11m 47s
test / run (oci-rootless-slirp4netns-detachnetns, ./frontend/dockerfile, integration)	10m 44s
test / run (oci-rootless-slirp4netns-detachnetns, ./frontend/dockerfile, dockerfile)	9m 41s
test / run (oci-snapshotter-stargz, ./frontend/dockerfile, integration)	10m 20s
test / run (oci-snapshotter-stargz, ./frontend/dockerfile, dockerfile)	11m 53s
image (mainline)	5m 15s
image (labs)	5m 18s
scout	0s
release	0s
	3h 11m 14s

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