Merge in GO/dnsproxy from upd-go to master

Squashed commit of the following:

commit e9960f65
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Tue Aug 8 19:48:59 2023 +0300

    netutil: satisfy golangci-lint

commit 412509f2
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Tue Aug 8 19:45:40 2023 +0300

    all: upd specs

commit 1be9e9ca
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Tue Aug 8 19:39:13 2023 +0300

    all: upd go, fix cmp