Backport the following change that was implemented for OCP 4.19 in IR-522 also to OCP 4.18:

We want to allow the image registry to run in new AWS regions without requiring a manual intervention in the code every time a new region pops up.
As we can see here every time a new region is added we need to manually add it to the list of known regions as well. This is required because the upstream project uses an AWS client that isn't receiving these new regions automatically.