Scala.dhall seems to have matrix.scala instead of matrix.java for jdk version

https://github.com/regadas/github-actions-dhall/blob/master/examples/scala.dhall

I'm having trouble using this for my project because of this line:

https://github.com/regadas/github-actions-dhall/blob/master/examples/scala.dhall#L51

I think it should be `matrix.java` here instead of `matrix.scala`. Otherwise I'm getting errors like "jdk 2.12.11 does not exist".