Remove sun as maintainer for Language subsystem

What can I even say? sun's prompt help on a Taxonomy API addition issue for Drupal 7 back in 2011 is the reason I'm involved in Drupal core at all, period.

Thank you sun for being a mentor and an inspiration, and for teaching me the only German expression I've ever needed: Eierlegende-wollmilchsau!

xjm → credited sun → .

never had the pleasure of meeting sun but from doing issue triage his name is everywhere!

Thanks sun for helping me find my feet in core contribution all those years ago

Thanks sun for your comments, when triaging issues I always find them helpful.

Committed to the current branches and checked that that the status in the Google group, the core project node, and the Slack channel are correct.

Thanks!

xjm → closed merge request !12781