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Problem
The latest Scala 2.13.x version is compatible with Scala 3.0.0 and includes many useful compiler-tools (e.g. warnings) to make the transition - and development in general - easier. Even if we don't have a real Scala 3 cross-build, 2.13.6 can be consumed by Scala 3 projects.
Solution
Updating Scala 2.13.1 to 2.13.6
Result
The build uses Scala 2.13.6. I also used the 2.13.x version as default as it has many extremely useful warnings that 2.12.x doesn't have. The only part that needed fixing is some reflection code as 2.13.5 changed encoding of method-parameter names.
As usual, I cannot tell if this clashes with any Twitter-internal things, so please tell me if it does.