[Examples] Update the AWS examples to have 600Mi of memory

[MyannaHarris]

This change updates the AWS examples to have 600Mi of memory because CAS downloads a pricing file that contains EC2 instance info at startup which grows each time there's new EC2 instance information available. Currently the largest region is hitting the 300Mi limit when downloading that file, so we are increasing the memory limit in our examples for customers.

[gjtempleton]

Thanks for the PR, it won't solve the problems for everyone as we can't cherry-pick it back everywhere, but have you had a look at #4199 for an approach to optimising how we do the reading in as well?

I guess we can revisit these examples once every supported version is using a more efficient method so can merge this as-is for now, as sad as it makes me that the CA needs this much memory.

/lgtm
/approve

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[MyannaHarris]

Thank you! Yes, hopefully we can optimize this more going forward.