iOS 16 compatibility

### Prerequisites

- [X] I have checked the [Wiki](https://github.com/AdguardTeam/AdGuardHome/wiki) and [Discussions](https://github.com/AdguardTeam/AdGuardHome/discussions) and found no answer

- [X] I have searched other issues and found no duplicates

- [X] I want to report a bug and not ask a question

### Operating system type

Linux, Other (please mention the version in the description)

### CPU architecture

AMD64

### Installation

GitHub releases or script from README

### Setup

On one machine

### AdGuard Home version

0.713.13

### Description

I am running AdGuard Home in a Proxmox Container (on Debian Bullseye) since a long time without any issues.
So first of all thank you for this great product.

Last week I updated two iPhones (X and 12 Pro) to iOS 16. Since then I am facing the issue that AdGuard Home does not work properly together with the new iOS.
When I wake up a device it takes up to 20 seconds until it gets a response for a DNS request (i.e. via safari or another app).
After a lot of investigation I found, that this issue is likely related to IPv4. (Don't know why iOS prefers IPv4 DNS over IPv6)
This can also be reliably reproduced by turning wifi off and on again.
The issue does not exist for devices running iOS 15.6.1 or iPadOS 15.7!

Here some workarounds that helped me (hopefully temporarily) to come around this issue.
#1: I set up another DNSv4 server and configured it via DHCP to be used for my devices. The upstream for this temp. DNS server is AdGuard Home.
#2: I configured manual DNS settings on iOS only to use my AdGuard Home IPv6 DNS server. (This is not really a workaround.)

Let me know if you need further information like configs.

Edit: No private relay in use.