Bump github.com/sagernet/sing from 0.5.1 to 0.7.5 #30

Job	Run time
check-assets	4s
build (freebsd, amd64)	53s
build (freebsd, 386)	53s
build (windows, 386)	51s
build (windows, amd64)	52s
build (linux, 386)	1m 4s
build (linux, amd64)	51s
build (linux, arm, 5)	1m 0s
build (android, amd64, android-amd64)	1m 19s
build (darwin, amd64)	59s
build (openbsd, amd64)	50s
build (openbsd, 386)	54s
build (darwin, arm64)	1m 0s
build (linux, mips64)	51s
build (android, arm64)	1m 15s
build (linux, loong64)	58s
build (windows, arm64)	51s
build (windows, arm, 7)	47s
build (linux, riscv64)	58s
build (linux, arm, 6)	52s
build (linux, mipsle)	1m 31s
build (linux, arm64)	58s
build (linux, ppc64)	52s
build (linux, arm, 7)	55s
build (linux, ppc64le)	58s
build (linux, mips)	1m 21s
build (openbsd, arm, 7)	50s
build (linux, mips64le)	50s
build (freebsd, arm, 7)	48s
build (linux, s390x)	1m 0s
build (freebsd, arm64)	1m 0s
build (openbsd, arm64)	52s
	29m 57s

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