🌱 do not use io/ioutil anymore

[xrstf]

Go 1.16 deprecated the usage of io/ioutil and this PR performs the necessary changes to get rid of that package. Go 1.17 is the minimum supported version of controller-runtime since #1714 (November 2021).

/kind cleanup

Fixes #1518

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: alvaroaleman, xrstf

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