Upgrade golang and dependencies #71

Job	Run time
build (darwin, amd64, git-backup-darwin-intel)	22s
build (darwin, arm64, git-backup-darwin-m1)	30s
build (linux, amd64, git-backup-linux-x64)	31s
build (linux, arm64, git-backup-linux-arm64)	24s
build (linux, arm, GOARM=7, git-backup-linux-armv7)	28s
build (windows, amd64, git-backup-windows-x64.exe)	23s
Build Docker	26s
	3m 4s

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