Drop ioutil package.
As it is deprecation , and can be replaced well.
Deprecated: As of Go 1.16, the same functionality is now
provided by package [io](https://pkg.go.dev/io)
or package [os](https://pkg.go.dev/os),
and those implementations should be preferred in new code
/kind cleanup
Drop ioutil package. As it is deprecation , and can be replaced well.