migrate to github.com/moby/sys/reexec #5084

Job	Run time
prepare	1s
test / prepare	2m 12s
test / run (containerd, ./frontend/dockerfile, integration)	4m 57s
test / run (containerd, ./frontend/dockerfile, dockerfile)	6m 54s
test / run (containerd-rootless, ./frontend/dockerfile, integration)	5m 5s
test / run (containerd-rootless, ./frontend/dockerfile, dockerfile)	6m 44s
test / run (containerd-1.6, ./frontend/dockerfile, integration)	5m 22s
test / run (containerd-1.6, ./frontend/dockerfile, dockerfile)	7m 2s
test / run (containerd-1.7, ./frontend/dockerfile, integration)	5m 30s
test / run (containerd-1.7, ./frontend/dockerfile, dockerfile)	7m 38s
test / run (containerd-snapshotter-stargz, ./frontend/dockerfile, integration)	6m 20s
test / run (containerd-snapshotter-stargz, ./frontend/dockerfile, dockerfile)	7m 49s
test / run (oci, ./frontend/dockerfile, integration)	4m 47s
test / run (oci, ./frontend/dockerfile, dockerfile)	6m 28s
test / run (oci-rootless, ./frontend/dockerfile, integration)	4m 33s
test / run (oci-rootless, ./frontend/dockerfile, dockerfile)	6m 23s
test / run (oci-rootless-slirp4netns-detachnetns, ./frontend/dockerfile, integration)	4m 55s
test / run (oci-rootless-slirp4netns-detachnetns, ./frontend/dockerfile, dockerfile)	5m 53s
test / run (oci-snapshotter-stargz, ./frontend/dockerfile, integration)	4m 37s
test / run (oci-snapshotter-stargz, ./frontend/dockerfile, dockerfile)	6m 13s
image (mainline)	5m 29s
image (labs)	5m 25s
scout	0s
release	0s
	2h 0m 17s

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