AWS c7g instances unknown to CitC

[boegel]

Error: Could not find shape information for 'c7g.2xlarge'.

It seems like my existing CitC cluster doesn't know about the c7g (Graviton3) instances yet, see also https://aws.amazon.com/ec2/instance-types/c7g/ .

@milliams Any idea how to fix this (for an existing cluster)?
I'm happy to open a PR to add the necessary info so c7g instances are known for new CitC clusters, if you can give me some pointers...

[boegel]

Hmm, clusterinthecloud/support#10 tells me this info should be coming from the AWS API...
Apparently that's not the case?

[boegel]

I tried updating boto3 to the latest version using sudo /opt/cloud_sdk/bin/python -m pip install -U boto3.

It seems like CitC is using that the query the AWS SDK for available instance types, but perhaps boto3 isn't aware of C7g yet?!