Automated cherry pick of #78016: fix: failed to close kubelet->API connections on heartbeat

[gaorong]

Cherry pick of #78016 on release-1.14.

#78016: fix: failed to close kubelet->API connections on heartbeat

[k8s-ci-robot]

Hi @gaorong. Thanks for your PR.

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[gaorong]

/kind bug
/priority important-soon
/assign @liggitt

[liggitt]

/ok-to-test
/lgtm
/approve
/milestone v1.14
/assign @tpepper @aleksandra-malinowska

[liggitt]

this fixes a regression in kubelet heartbeating in 1.14 in configurations that do not use client certificate rotation

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: gaorong, liggitt

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[tpepper]

/retest