vendor: update buildkit to master@d5c1d785b042 #2897

Job	Run time
prepare-binaries	8s
buildkit-edge	2m 13s
prepare-test	2m 19s
binaries (darwin/amd64)	2m 22s
binaries (darwin/arm64)	2m 31s
binaries (linux/amd64)	2m 30s
binaries (linux/arm/v6)	2m 20s
binaries (linux/arm/v7)	2m 12s
binaries (linux/arm64)	2m 5s
binaries (linux/ppc64le)	2m 7s
binaries (linux/riscv64)	2m 10s
binaries (linux/s390x)	2m 6s
binaries (windows/amd64)	2m 17s
binaries (windows/arm64)	2m 16s
test (docker, ./tests)	4m 7s
test (docker\+containerd, ./tests)	4m 8s
test (docker-container, ./tests)	4m 55s
test (remote, ./tests)	3m 43s
test (./..., 1)	4m 56s
release	18s
bin-image	0s
	51m 43s

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