cherry-pick: 3987 Fix nil pointer dereference

Merge in DNS/adguard-home from 3987-fix-nil-deref to master

Updates #3987.
Updates #2846.

Squashed commit of the following:

commit d653e09ce88a8b10b2a17fea1563c419895c714c
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Thu Dec 23 20:08:51 2021 +0300

    all: log changes

commit c47a4eeacf76fa7df2d01af166dee9d52528ac58
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Thu Dec 23 19:22:39 2021 +0300

    aghnet: fix windows tests

commit 9c91f14ccfe967ada3c00ddb86d673238e52c12d
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Thu Dec 23 19:09:49 2021 +0300

    aghnet: imp code readability, docs

commit d3df15d1892e4ebfe7f8ea7144e39a0c712fce52
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Thu Dec 23 18:47:28 2021 +0300

    aghnet: fix nil pointer dereference

CHANGELOG.md

@@ -10,9 +10,38 @@ and this project adheres to
 ## [Unreleased]
 
 <!--
-## [v0.107.1] - 2022-01-25 (APPROX.)
+## [v0.108.0] - 2021-06-01 (APPROX.)
 -->
 
+### Added
+
+- `windows/arm64` support ([#3057]).
+
+### Deprecated
+
+- Go 1.17 support.  v0.109.0 will require at least Go 1.18 to build.
+
+### Removed
+
+- Go 1.16 support.
+
+[#3057]: https://github.com/AdguardTeam/AdGuardHome/issues/3057
+
+
+
+<!--
+## [v0.107.1] - 2021-12-29 (APPROX.)
+-->
+## v0.107.1 - UNRELEASED
+
+### Fixed
+
+- Panic on port availability check during installation ([#3987]).
+
+[#3987]: https://github.com/AdguardTeam/AdGuardHome/issues/3987
+
+
+
 ## [v0.107.0] - 2021-12-21
 
 ### Added