multimedia/gst123: Update 0.3.3 → 0.4.1 and remove DEPRECATED

Changes in port:

• undeprecate;
• get maintainership;
• pet portclippy.

Since version 0.4.0, migrate the configuration file from ~/.gst123rc
to $XDG_CONFIG_HOME/gst123rc which defaults to ~/.config/gst123rc.

Changelogs:
https://github.com/swesterfeld/gst123/releases/tag/0.4.0
https://github.com/swesterfeld/gst123/releases/tag/0.4.1

PR: 283852
Approved by: Herbert J. Skuhra <herbert@gojira.at> (former maintainer)