Pull request 1838: 5716-content-type

Updates #5716.

Squashed commit of the following:

commit 584e6771c82b92857e3c13232e942cad5c183682
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Wed Apr 19 14:54:43 2023 +0300

    all: fix content types

CHANGELOG.md

@@ -25,9 +25,13 @@ NOTE: Add new changes BELOW THIS COMMENT.
 
 ### Fixed
 
+- Incorrect `Content-Type` header value in `POST /control/version.json` and `GET
+  /control/dhcp/interfaces` HTTP APIs ([#5716]).
 - Provided bootstrap servers are now used to resolve the hostnames of plain
   UDP/TCP upstream servers.
 
+[#5716]: https://github.com/AdguardTeam/AdGuardHome/issues/5716
+
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