InstanceTypes not available in af-south-1

[az-nz-github]

Feature Request

We were trying to create EC2 of m6i.xlarge in af-south-1 region which was added as part of commit https://github.com/apache/libcloud/commit/e482e9e66341827cced87e156044a474306c2b4f. But it is missing the instance_types field as empty. This is not letting us to create EC2 in af-south-1 region.

What can be the mitigation for this to do programatically?

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