Update to 2.13.0

Changelog:

• Collections: Standard library collections have been overhauled for simplicity, performance, and safety. This is the centerpiece of the release.
• Standard library: Future is faster and more robust. Elsewhere, useful classes and methods have been added.
• Language: Literal types, partial unification, by-name implicits, more.
• Compiler: 5-10% faster, deterministic output, improved optimizer.

PR: 239944
Submitted by: Jens Grassel <freebsd-ports@jan0sch.de> (maintainer)
Sponsored by: Netzkommune GmbH