bugfix: Fix Bloop import (#2825)

It looks like it's actually a mistake in the build, but since bloopInstall tries to import everything it would only show up there. If we run scala 3 targets, this would not show up.

Author: tgodzik

build.sc

@@ -99,7 +99,7 @@ object `tasty-lib` extends Cross[TastyLib](Scala.all) with CrossScalaDefaultToIn
 object `scala3-runtime` extends Cross[Scala3Runtime](Scala.scala3MainVersions)
     with CrossScalaDefaultToInternal
 // Logic to process classes that is shared between build and the scala-cli itself
-object `scala3-graal` extends Cross[Scala3Graal](Scala.mainVersions)
+object `scala3-graal` extends Cross[Scala3Graal](Scala.scala3MainVersions)
     with CrossScalaDefaultToInternal
 // Main app used to process classpath within build itself
 object `scala3-graal-processor` extends Cross[Scala3GraalProcessor](Scala.scala3MainVersions)