apiextensions: add maximum for validation

[nikhita]

Missed the Maximum field for validation. Adding it now.

Release note:

NONE

/cc @sttts

[k8s-ci-robot]

Hi @nikhita. Thanks for your PR.

I'm waiting for a kubernetes member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[deads2k]

/lgtm
/approve no-issue
/ok-to-test

[k8s-github-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: deads2k, nikhita

Associated issue requirement bypassed by: deads2k

The full list of commands accepted by this bot can be found here.

Needs approval from an approver in each of these OWNERS Files:

• staging/src/k8s.io/apiextensions-apiserver/OWNERS [deads2k]

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[nikhita]

/retest

[nikhita]

/retest

[k8s-github-robot]

Automatic merge from submit-queue (batch tested with PRs 50832, 51119, 51636, 48921, 51712)