[pkg/remote] clean up ioutil

[my-git9]

[pkg/remote] Clean up io/ioutil package
Ref: #5874

[tekton-robot]

Hi @my-git9. Thanks for your PR.

I'm waiting for a tektoncd member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[JeromeJu]

/ok-to-test
/release-note-none
/kind cleanup

[tekton-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: lbernick

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[Yongxuanzhang]

/lgtm