Update Azure image reference

[momesgin]

Summary

Fixes #15333

Occurred changes and/or fixed issues

Updated the hardcoded value for Azure image reference.

Technical notes summary

Areas or cases that should be tested

Make sure you can successfully provision an Azure cluster with the default settings.

Areas which could experience regressions

n/a

Screenshot/Video

Checklist

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[mantis-toboggan-md]

LGTM