community/chromium: security upgrade to 120.0.6099.216, various fixes

closes !58721 (closed), closes !58730 (closed) - combines both in one commit

https://chromereleases.googleblog.com/2024/01/stable-channel-update-for-desktop_9.html

Disable dns config service, which depends on __res_stat and does not work at all. fixes: #15660 (closed)

Fix build with libxml2 2.12. ref: https://invent.kde.org/qt/qt/qtwebengine-chromium/-/commit/0ac7411195581d33bb07ead3ff2abc0610f96ff8

Build with bundled ffmpeg. fixes #15585 (closed)

Co-authored-by: Natanael Copa ncopa@alpinelinux.org