vendor: Bump golang.org/x/sys/unix to a newer version

The current vendor of sys/unix is really old, and doesn't work on arm64 and ppc64le
Updating to the latest version might also fix other issues

ref #209

vendor/golang.org/x/sys/unix/syscall.go

@@ -68,6 +68,8 @@ func (tv *Timeval) Nano() int64 {
 	return int64(tv.Sec)*1e9 + int64(tv.Usec)*1000
 }
 
+func TimevalToNsec(tv Timeval) int64 { return int64(tv.Sec)*1e9 + int64(tv.Usec)*1e3 }
+
 // use is a no-op, but the compiler cannot see that it is.
 // Calling use(p) ensures that p is kept live until that point.
 //go:noescape