[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