Bump github.com/sagernet/sing from 0.5.1 to 0.7.8 #45

Job	Run time
check-assets	5s
build (windows, 386)	55s
build (openbsd, amd64)	1m 4s
build (freebsd, amd64)	47s
build (windows, amd64)	55s
build (linux, amd64)	47s
build (darwin, amd64)	1m 4s
build (linux, arm, 6)	54s
build (freebsd, 386)	50s
build (linux, arm, 5)	59s
build (linux, arm, 7)	49s
build (openbsd, 386)	53s
build (android, amd64, android-amd64)	1m 16s
build (windows, arm, 7)	47s
build (linux, mips64)	57s
build (windows, arm64)	56s
build (android, arm64)	1m 19s
build (linux, arm64)	57s
build (darwin, arm64)	48s
build (linux, mips64le)	44s
build (linux, 386)	44s
build (freebsd, arm, 7)	50s
build (linux, mips)	1m 21s
build (freebsd, arm64)	53s
build (linux, loong64)	48s
build (linux, s390x)	55s
build (linux, riscv64)	1m 1s
build (linux, mipsle)	1m 27s
build (linux, ppc64)	44s
build (linux, ppc64le)	54s
build (openbsd, arm, 7)	53s
build (openbsd, arm64)	45s
	29m 1s

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