Bump github.com/sagernet/sing from 0.5.1 to 0.7.8 #46

Job	Run time
check-assets	4s
build (windows, amd64)	1m 0s
build (openbsd, 386)	52s
build (freebsd, amd64)	56s
build (freebsd, 386)	47s
build (linux, amd64)	51s
build (windows, 386)	52s
build (linux, 386)	54s
build (linux, arm, 5)	57s
build (openbsd, amd64)	56s
build (darwin, arm64)	49s
build (linux, arm, 6)	51s
build (android, arm64)	1m 17s
build (darwin, amd64)	1m 1s
build (linux, arm, 7)	43s
build (windows, arm64)	49s
build (android, amd64, android-amd64)	1m 14s
build (linux, arm64)	46s
build (linux, mips64)	54s
build (windows, arm, 7)	48s
build (linux, ppc64le)	53s
build (linux, ppc64)	54s
build (linux, mipsle)	1m 21s
build (linux, mips64le)	51s
build (freebsd, arm64)	51s
build (freebsd, arm, 7)	56s
build (linux, loong64)	49s
build (linux, riscv64)	51s
build (linux, s390x)	51s
build (openbsd, arm64)	53s
build (linux, mips)	1m 25s
build (openbsd, arm, 7)	46s
	28m 42s

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