migrate to github.com/moby/sys/user #1946

Job	Run time
prepare	6s
test / prepare	2m 58s
binaries (darwin/amd64)	1m 33s
binaries (darwin/arm64)	1m 28s
binaries (linux/amd64)	3m 28s
binaries (linux/arm/v7)	3m 8s
binaries (linux/arm64)	3m 6s
binaries (linux/s390x)	3m 41s
binaries (linux/ppc64le)	2m 57s
binaries (linux/riscv64)	3m 47s
binaries (windows/amd64)	1m 45s
binaries (windows/arm64)	1m 27s
test / run (containerd, ./client ./cmd/buildctl ./worker/containerd ./solver ./frontend, integration)	14m 40s
test / run (containerd-rootless, ./client ./cmd/buildctl ./worker/containerd ./solver ./frontend, integr...	17m 43s
test / run (containerd-1.6, ./client ./cmd/buildctl ./worker/containerd ./solver ./frontend, integration)	17m 19s
test / run (containerd-snapshotter-stargz, ./client ./cmd/buildctl ./worker/containerd ./solver ./fronte...	13m 34s
test / run (oci, ./client ./cmd/buildctl ./worker/containerd ./solver ./frontend, integration)	11m 11s
test / run (oci-rootless, ./client ./cmd/buildctl ./worker/containerd ./solver ./frontend, integration)	10m 6s
test / run (oci-snapshotter-stargz, ./client ./cmd/buildctl ./worker/containerd ./solver ./frontend, int...	11m 46s
test / run (./..., 1, integration gateway)	7m 40s
test / run (./client, containerd, nydus, integration)	25m 27s
test / run (./client, oci, nydus, integration)	15m 46s
test / run (./..., nydus, 1, integration)	7m 12s
image	15m 25s
image (rootless)	14m 25s
release	25s
	3h 32m 3s

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