IPv6 is off, but AGH continues to listen to the port

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### Prerequisites

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- [x] I am running the latest version
- [x] I checked the documentation and found no answer
- [x] I checked to make sure that this issue has not already been filed

### Issue Details

* **Version of AdGuard Home server:**
* 0.105.2
* **How did you install AdGuard Home:**
* Github release
* **How did you setup DNS configuration:**
* VPS
* **Operating system and version:**
* Debian 10

### Expected Behavior

### Actual Behavior
Adapter does not support IPv6. IPv6 is completely off, but AGH continues to listen to the port:

### Additional Information
What is it? Some socket? For what? Why?😅