USHIFT-1527: update release note script for change in mirror layout

[dhellmann]

The OS name changed from "el9" to "elrhel-9", so look for both.

/assign @ggiguash

[openshift-ci-robot]

@dhellmann: This pull request references USHIFT-1527 which is a valid jira issue.

In response to this:

The OS name changed from "el9" to "elrhel-9", so look for both.

/assign @ggiguash

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[ggiguash]

/lgtm

[openshift-ci]

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[openshift-ci]

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