removing pin on kind image from v1.21

[sbdtu5498]

Fixes #19
cc: @lauralorenz

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/lifecycle stale

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/lifecycle rotten

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/close

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@k8s-triage-robot: Closed this PR.

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The Kubernetes project currently lacks enough active contributors to adequately respond to all issues and PRs.

This bot triages PRs according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
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/close

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[lauralorenz]

/reopen

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@lauralorenz: Reopened this PR.

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/reopen

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[lauralorenz]

/remove-lifecycle rotten

[lauralorenz]

/lgtm
/approve

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