go.mod: github.com/Microsoft/hcsshim v0.8.16

full diff: https://github.com/microsoft/hcsshim/compare/v0.8.15...v0.8.16

also updating github.com/Microsoft/hcsshim/test to current master

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

vendor/github.com/Microsoft/hcsshim/internal/safefile/safeopen.go

@@ -244,7 +244,7 @@ func RemoveRelative(path string, root *os.File) error {
 		err = deleteOnClose(f)
 		if err == syscall.ERROR_ACCESS_DENIED {
 			// Maybe the file is marked readonly. Clear the bit and retry.
-			clearReadOnly(f)
+			_ = clearReadOnly(f)
 			err = deleteOnClose(f)
 		}
 	}