Bump github.com/sagernet/sing from 0.5.1 to 0.7.6 #33

Job	Run time
check-assets	7s
build (windows, 386)	44s
build (openbsd, amd64)	1m 0s
build (freebsd, 386)	52s
build (linux, 386)	50s
build (freebsd, amd64)	1m 5s
build (darwin, amd64)	58s
build (openbsd, 386)	55s
build (windows, amd64)	50s
build (android, amd64, android-amd64)	1m 8s
build (linux, arm, 6)	48s
build (windows, arm64)	53s
build (linux, amd64)	52s
build (darwin, arm64)	48s
build (linux, arm, 7)	50s
build (linux, riscv64)	53s
build (android, arm64)	1m 12s
build (linux, ppc64)	44s
build (windows, arm, 7)	51s
build (linux, arm, 5)	55s
build (linux, mips64le)	49s
build (linux, loong64)	50s
build (linux, mips)	1m 23s
build (linux, mipsle)	1m 23s
build (linux, mips64)	44s
build (openbsd, arm, 7)	50s
build (linux, ppc64le)	56s
build (openbsd, arm64)	52s
build (freebsd, arm64)	57s
build (linux, arm64)	50s
build (freebsd, arm, 7)	43s
build (linux, s390x)	50s
	28m 22s

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