Update hcsshim to v0.12.3

Signed-off-by: Kirtana Ashok <kiashok@microsoft.com>

vendor/github.com/Microsoft/hcsshim/internal/interop/zsyscall_windows.go

@@ -33,9 +33,6 @@ func errnoErr(e syscall.Errno) error {
 	case errnoERROR_IO_PENDING:
 		return errERROR_IO_PENDING
 	}
-	// TODO: add more here, after collecting data on the common
-	// error values see on Windows. (perhaps when running
-	// all.bat?)
 	return e
 }
 
@@ -46,6 +43,6 @@ var (
 )
 
 func coTaskMemFree(buffer unsafe.Pointer) {
-	syscall.Syscall(procCoTaskMemFree.Addr(), 1, uintptr(buffer), 0, 0)
+	syscall.SyscallN(procCoTaskMemFree.Addr(), uintptr(buffer))
 	return
 }