No ipv6 support at entgo.io

IPv6 has been a standard for at least 5 years, and server providers are now charging for using ipv4 addresses. See [Amazon's article](https://aws.amazon.com/blogs/aws/new-aws-public-ipv4-address-charge-public-ip-insights/) and [Hetzner's pricing page](https://docs.hetzner.com/general/others/ipv4-pricing/).

I could be wrong but it seems like entgo.io uses AWS which supports dual stack networking.

- [x] The issue is present in the latest release.
- [x] I have searched the [issues](https://github.com/ent/ent/issues) of this repository and believe that this is not a duplicate.

## Current Behavior 😯

## Expected Behavior 🤔

entgo.io should have an AAAA record.

## Steps to Reproduce 🕹

```
nslookup entgo.io
```

Steps:

1.
2.
3.
4.

## Your Environment 🌎

| Tech | Version |
| ----------- | ------- |
| Go | 1.17.? |
| Ent | 0.9.? |
| Database | MySQL |
| Driver | https://github.com/go-sql-driver/mysql |