AdguardTeam / AdguardTeam/dnsproxy

v0.81.1 fails to parse IPv6 in upstream h3 URL

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Description

v0.81.1

```
2026/04/13 12:20:38.436360 ERROR running dnsproxy err="configuring proxy: parsing fallback upstreams configuration: parsing error at index 0: cannot prepare the upstream: failed to parse h3://2606:4700:4700::1112/dns-query: parse \"h3://2606:4700:4700::1112/dns-query\": invalid port \":4700:4700::1112\" after host"
```
It worked in v0.81.0

Update: putting the IPv6 in `[]` fixes it, i.e. `h3://[2606:4700:4700::1112]/dns-query`

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