Bump github.com/sagernet/sing from 0.5.1 to 0.7.5 #29

Job	Run time
check-assets	3s
build (freebsd, amd64)	59s
build (windows, 386)	58s
build (openbsd, amd64)	55s
build (linux, arm, 7)	53s
build (openbsd, 386)	52s
build (darwin, arm64)	59s
build (linux, arm, 6)	50s
build (windows, amd64)	59s
build (linux, arm, 5)	53s
build (linux, 386)	54s
build (darwin, amd64)	1m 2s
build (windows, arm, 7)	56s
build (freebsd, 386)	52s
build (linux, riscv64)	1m 2s
build (linux, arm64)	50s
build (android, amd64, android-amd64)	1m 20s
build (linux, loong64)	50s
build (windows, arm64)	59s
build (linux, amd64)	1m 0s
build (linux, mipsle)	1m 25s
build (android, arm64)	1m 21s
build (linux, ppc64)	49s
build (linux, mips64le)	49s
build (freebsd, arm, 7)	58s
build (linux, mips)	1m 24s
build (linux, mips64)	53s
build (freebsd, arm64)	1m 0s
build (linux, ppc64le)	50s
build (linux, s390x)	52s
build (openbsd, arm, 7)	54s
build (openbsd, arm64)	59s
	30m 20s

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