build

update to go 1.21.3 #2872

Job	Run time
prepare-test	2m 41s
prepare-binaries	5s
buildkit-edge	2m 44s
binaries (darwin/amd64)	2m 43s
binaries (darwin/arm64)	2m 17s
binaries (linux/amd64)	2m 12s
binaries (linux/arm/v6)	2m 14s
binaries (linux/arm/v7)	2m 1s
binaries (linux/arm64)	2m 9s
binaries (linux/ppc64le)	2m 14s
binaries (linux/riscv64)	2m 15s
binaries (linux/s390x)	2m 6s
binaries (windows/amd64)	2m 11s
binaries (windows/arm64)	2m 37s
test (docker, ./tests)	4m 48s
test (docker\+containerd, ./tests)	4m 21s
test (docker-container, ./tests)	3m 52s
test (remote, ./tests)	3m 23s
test (./..., 1)	4m 33s
release	29s
bin-image	0s
	51m 55s

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