Update k8s dependency version to 1.21

[xinyanwu409]

Signed-off-by: xinyanwu409 wxinyan@vmware

What type of PR is this?

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/kind cleanup

What this PR does / why we need it:
This pr updates k8s dependency version to 1.21
Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

[k8s-ci-robot]

Hi @xinyanwu409. Thanks for your PR.

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[fejta-bot]

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[xing-yang]

/ok-to-test

[xing-yang]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: xing-yang, xinyanwu409

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