[release-4.20] USHIFT-6036: Update common_versions.sh file when 4.20 is released

[agullon]

Set "zstream" to fetch 4.20 zstream artifacts for Release Testing.

[openshift-ci-robot]

@agullon: This pull request references USHIFT-6036 which is a valid jira issue.

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In response to this:

Set "zstream" to fetch 4.20 zstream artifacts for Release Testing.

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[agullon]

/test e2e-aws-tests-bootc

[pacevedom]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: agullon, pacevedom

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[pacevedom]

/label backport-risk-assessed
/label jira/valid-bug

[sdodson]

/label staff-eng-approved

[agullon]

/verified by ci/prow/ jobs

[openshift-ci-robot]

@agullon: This PR has been marked as verified by ci/prow/ jobs.

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/verified by ci/prow/ jobs

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[openshift-ci]

@agullon: all tests passed!

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