refactor: string in slice is now part of stdlib

[emirot]

What

This function is now part of standard golang library.

[linux-foundation-easycla]

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• ✅ login: emirot / name: Nolan Emirot (bcb1a36)

[k8s-ci-robot]

Hi @emirot. Thanks for your PR.

I'm waiting for a kubernetes-sigs 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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[stormqueen1990]

/ok-to-test
/lgtm

[koba1t]

Thanks!

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: emirot, koba1t

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