printers: fix json types – int64 is only allowed integer

[sttts]

We have the invariant in apimachinery that all integers in JSON are int64. We panic on other types on deepcopy and possibly at other occasions.

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[liggitt]

/lgtm
/status approved-for-milestone
/sig api-machinery

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[nikhita]

staging godeps needs update.

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[hzxuzhonghu]

re-add tag
/lgtm

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This pull-request has been approved by: hzxuzhonghu, liggitt, sttts

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[k8s-ci-robot]

New changes are detected. LGTM label has been removed.

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Automatic merge from submit-queue (batch tested with PRs 64613, 64596, 64573, 64154, 64639). If you want to cherry-pick this change to another branch, please follow the instructions here.