Pull request 2404: 7801-fix-cmd-update

Closes #7801.

Squashed commit of the following:

commit f6e924e939eb9487e2c7743f04bb217e758ef253
Merge: 9caa54933 8c8323ae6
Author: Stanislav Chzhen <s.chzhen@adguard.com>
Date:   Wed May 7 16:22:09 2025 +0300

    Merge branch 'master' into 7801-fix-cmd-update

commit 9caa5493302af11b8d522feb2cf6e6f0facaec53
Author: Stanislav Chzhen <s.chzhen@adguard.com>
Date:   Tue Apr 29 20:52:09 2025 +0300

    home: imp code

commit 765ea0023972e326c54f0c17ba79f3feca8ff803
Author: Stanislav Chzhen <s.chzhen@adguard.com>
Date:   Tue Apr 29 20:16:55 2025 +0300

    all: fix cmd update

CHANGELOG.md

@@ -20,10 +20,14 @@ NOTE: Add new changes BELOW THIS COMMENT.
 
 ### Fixed
 
+- Command line option `--update` when the `dns.serve_plain_dns` configuration property was disabled ([7801]).
+
 - DNS cache not working for custom upstream configurations.
 
 - Validation process for the DNS-over-TLS, DNS-over-QUIC, and HTTPS ports on the *Encryption Settings* page.
 
+[#7801]: https://github.com/AdguardTeam/AdGuardHome/issues/7801
+
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