ci: update bake-action to v6 #270

Job	Run time
binutils-targets	3s
ld-targets	6s
utils-lipo	18s
ld64	31m 54s
utils-sigtool	34s
binutils (binutils-linux-386-alpine)	27s
binutils (binutils-linux-amd64-alpine)	27s
binutils (binutils-linux-arm64-alpine)	18m 54s
binutils (binutils-linux-armv6-alpine)	36s
binutils (binutils-linux-armv7-alpine)	19s
binutils (binutils-linux-ppc64le-alpine)	24s
binutils (binutils-linux-riscv64-alpine)	20s
binutils (binutils-linux-s390x-alpine)	21s
binutils (binutils-windows-386-alpine)	34s
binutils (binutils-windows-amd64-alpine)	16s
ld (ld-linux-386-static-tgz)	30s
ld (ld-linux-amd64-static-tgz)	41s
ld (ld-linux-arm64-static-tgz)	31s
ld (ld-linux-armv6-static-tgz)	31s
ld (ld-linux-armv7-static-tgz)	31s
ld (ld-linux-ppc64le-static-tgz)	16m 56s
ld (ld-linux-riscv64-static-tgz)	16m 41s
ld (ld-linux-s390x-static-tgz)	32s
ld (ld-windows-386-static-tgz)	30s
ld (ld-windows-amd64-static-tgz)	16m 1s
release	1s
	1h 48m 58s

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