Update Cortex versions (eksctl, EKS, AWS IAM, Python, etc)

[RobertLucian]

This PR updates Cortex's versions of everything as instructed in the versions.md README. It also adds the latest instances AWS has started supporting, like the g5 instances.

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checklist:

• [x] run make test and make lint
• [ ] test manually (i.e. build/push all images, restart operator, and re-deploy APIs)
• [ ] update docs and add any new files to summary.md (view in gitbook after merging)