lang/scala: Update to 2.12.3
- Submitter becomes maintainer. The current maintainer is absent without leave (> 3 maintainer timeouts) and Jens submitted the last 3 updates to the port.
PR: 221623
Submitted by: Jens Grassel <jan0sch@mykolab.com>
Approved by: mitsururike@gmail.com (maintainer timeout, 3 weeks)