[release-4.20] NO-ISSUE: add jiazha to approvers

[openshift-cherrypick-robot]

This is an automated cherry-pick of #477

/assign jianzhangbjz

[perdasilva]

/approve
/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: openshift-cherrypick-robot, perdasilva

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Needs approval from an approver in each of these files:

• DOWNSTREAM_OWNERS [perdasilva]

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[openshift-ci]

@openshift-cherrypick-robot: 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/okd-scos-e2e-aws-ovn	4c4448e	link	false	/test okd-scos-e2e-aws-ovn

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[oceanc80]

/label backport-risk-assessed

[tmshort]

This is a backport, so technically, it needs an OCPBUGS, and not "NO-ISSUE"