Bump go version to 1.19

[zchenyu]

Required after https://github.com/kubernetes/kube-openapi/pull/371 uses atomic.Pointer

Closes https://github.com/kubernetes/kube-openapi/issues/379

[linux-foundation-easycla[bot]]

The committers listed above are authorized under a signed CLA.

• :white_check_mark: login: zchenyu / name: Chenyu Zhao (12621878956bceb9bf1e5c7e43b5ccb63b3c028c)

[k8s-ci-robot]

Welcome @zchenyu!

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[zchenyu]

/check-cla

[zchenyu]

/easycla

[Jefftree]

/approve Leaving lgtm to @apelisse to trigger the tests /assign @apelisse

[apelisse]

/approve /lgtm

Thanks!

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: apelisse, Jefftree, zchenyu

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/kubernetes/kube-openapi/blob/master/OWNERS)~~ [Jefftree,apelisse] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment