Drop use of deprecated io/ioutil package

[tklauser]

The io/ioutil package was deprecated in Go 1.16¹, which is the minimum required version per go.mod. Replace the uses of the package with the respective replacement functions.

Footnotes

1. https://go.dev/doc/go1.16#ioutil ↩

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[neolit123]

/lgtm
/approve
/ok-to-test

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