chore: fix deprecated circleci image #6379
Merged
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Motivation
The ubuntu image currently being used for the circleci ARM test is deprecated
https://discuss.circleci.com/t/linux-image-deprecations-and-eol-for-2024/50177
We did see a failing CI test on PR #6378 during the recent circleci brown out on 4th March
Solution
Updated circleci to use the default image tag.
Note this also updates it to use
22.04
rather than20.04