multimedia/emby-server: Update to 4.5.3.0

Minor release with several bug fixes, some enhancements
and new features. The port enables LAME by default now.

Changelog: https://github.com/MediaBrowser/Emby.Releases/releases/tag/4.5.3.0

PR: 251566
Submitted by: Dries Michiels <driesm.michiels@gmail.com> (maintainer)
Approved by: tcberner (mentor)
Differential Revision: https://reviews.freebsd.org/D27477