always force sbt-scalajs version

Author: smarter

community-build/src/scala/dotty/communitybuild/projects.scala

@@ -68,7 +68,7 @@ final case class SbtCommunityProject(
     project: String,
     sbtTestCommand: String,
     extraSbtArgs: List[String] = Nil,
-    forceUpgradeSbtScalajsPlugin: Boolean = false,
+    forceUpgradeSbtScalajsPlugin: Boolean = true,
     dependencies: List[CommunityProject] = Nil,
     sbtPublishCommand: String = null) extends CommunityProject:
   override val binaryName: String = "sbt"