🌱 Fix grammar in release script

[typeid]

What this PR does / why we need it:
This PR fixes a small grammar mistake in the release script.

Area example:
/area release

[k8s-ci-robot]

Hi @typeid. 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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[chrischdi]

/lgtm

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: d403518c4798d680eb962a1cd3f14a8548ca5405

[killianmuldoon]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: killianmuldoon

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[killianmuldoon]

/ok-to-test