chore: remove refs to deprecated io/ioutil

[testwill]

No description provided.

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[k8s-ci-robot]

Hi @testwill. Thanks for your PR.

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[vteratipally]

Thank you for the PR.

/ok-to-test

[vteratipally]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: testwill, vteratipally

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