Support for R8g instance types

[cPu1]

More details: https://aws.amazon.com/blogs/aws/aws-graviton4-based-amazon-ec2-r8g-instances-best-price-performance-in-amazon-ec2/

[kylehutchens]

Looking for this too, I think this list just needs to get updated to include the r8g prefix.

[github-actions[bot]]

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