[pkg/termination] cleanup io/ioutil

[my-git9]

Changes

Ref: #5874

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Release Notes

NONE

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Hi @my-git9. Thanks for your PR.

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[bendory]

/ok-to-test

[bendory]

/kind cleanup

[tekton-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: bendory, vdemeester

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[lbernick]

/lgtm