Pull request 2023: upd-node

Squashed commit of the following:

commit 83b0aa9703a7fd023eeb82a4fdf43a5717a3d9cf
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Thu Oct 5 17:42:38 2023 +0300

    all: upd node

CHANGELOG.md

@@ -29,6 +29,10 @@ NOTE: Add new changes BELOW THIS COMMENT.
 - Ability to specify for how long clients should cache a filtered response,
   using the *Blocked response TTL* field on the *DNS settings* page ([#4569]).
 
+### Changed
+
+- Node 16 is now required to build the frontend.
+
 ### Fixed
 
 - Improper validation of password length ([#6280]).