Update Knot Resolver to version 5.4.0
Recently, there was released a new version 5.4.0 of Knot Resolver.
Changelog: https://www.knot-resolver.cz/2021-07-29-knot-resolver-5.4.0.html
Would it be possible to take a look? This should be send to `develop` branch of this repository, so we can include it in minor release.
**Knot Resolver** runs on `Turris Omnia` and `Turris MOX` (Shield). Once you do run time testing, then it needs to be send to the upstream repository. In this case, I'm talking about `packages` feed.
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