Merge in DNS/dnsproxy from 4505-tls-conn-leak to master

Updates AdguardTeam/AdGuardHome#4505.

Squashed commit of the following:

commit 4a4b52f710e51d1007b5dcda7cc04c3e5d54c0ff
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Thu Apr 21 15:51:47 2022 +0300

    upstream: close conn on err