Use updated SBT for paradox and scalameter

[retronym]

To avoid:

[paradox] [info] 'compiler-interface' not yet compiled for Scala 2.10.6. Compiling...
[paradox:error] error: error while loading package, Missing dependency 'object java.lang.Object in compiler mirror', required by /home/jenkins/.ivy2/cache/org.scala-lang/scala-library/jars/scala-library-2.10.6.jar(scala/package.class)
[paradox:error] error: error while loading package, Missing dependency 'object java.lang.Object in compiler mirror', required by /home/jenkins/.ivy2/cache/org.scala-lang/scala-library/jars/scala-library-2.10.6.jar(scala/runtime/package.class)
[paradox:error] error: scala.reflect.internal.MissingRequirementError: object java.lang.Object in compiler mirror not found.
[paradox:error]     at scala.reflect.internal.MissingRequirementError$.signal(MissingRequirementError.scala:16)
[paradox:error]     at scala.reflect.internal.MissingRequirementError$.notFound(MissingRequirementError.scala:17)
[paradox:error]     at scala.reflect.internal.Mirrors$RootsBase.getModuleOrClass(Mirrors.scala:48)
[paradox:error]     at scala.reflect.internal.Mirrors$RootsBase.getModuleOrClass(Mirrors.scala:40)

[SethTisue]

uhh, well that surprises me that should even be necessary. isn't it supposed to already be covered by

build += {
  sbt-version: ${vars.sbt-version}

?

does that actually have no effect and we've believed otherwise for years now...?

that seems implausible, because whenever a project upgrades from sbt 0.13 to sbt 1, it breaks, and we need to add extra.sbt-version: ${vars.sbt-1-version} to make it work again. that seems like proof like we are successfully overriding project's own sbt version build-wide already

I'm puzzled.

[SethTisue]

sorry for the delay btw, I don't know how I missed the notification on this

[SethTisue]

this doesn't fix it. I'm investigating.

[SethTisue]

see #609 (comment)