[Optimization] Switch VPC from IPv4 to IPv6

Is your feature request related to a problem? Please describe. Switch VPC from IPv4 to IPv6. IPv4 IP's you have to pay for (though I think the free-tier includes a couple hours). There's a lot of parts that'd have to change, like Route53 to use AAAA records instead of A, security group updates, etc.

This is just to possibly reduce cost of everything.

Describe the solution you'd like Switch VPC from IPv4 to IPv6

Describe alternatives you've considered We can just keep it on IPv4, if we stay inside free-tier. This is something I can easily see AWS changing one day though as IPv4 ip's get more scarce.

Additional context N/A