Bump kubectl to 0.28.3

[qbarrand]

/cc @chr15p @ybettan @yevgeny-shnaidman @ybettan

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[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: qbarrand

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[openshift-ci]

@qbarrand: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/security	94076e4	link	false	/test security

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[yevgeny-shnaidman]

/lgtm