[release-3.5] Fix unsynchronized range over leaseCache.entries

[k8s-infra-cherrypick-robot]

This is an automated cherry-pick of #22129

/assign ahrtr

[kubernetes-prow]

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[ahrtr]

/retest

[kubernetes-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ahrtr, k8s-infra-cherrypick-robot

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[ahrtr]

/retest