Port sbt client

build.sbt

@@ -191,7 +191,6 @@ lazy val sbtRoot: Project = (project in file("."))
       mainProj,
       sbtProj,
       bundledLauncherProj,
-      sbtClientProj,
     )).map(p => LocalProject(p.id)): _*
   )
   .settings(
@@ -1139,7 +1138,6 @@ lazy val sbtClientProj = (project in file("client"))
   .dependsOn(commandProj)
   .settings(
     commonBaseSettings,
-    scalaVersion := "2.12.11", // The thin client does not build with 2.12.12
     publish / skip := true,
     name := "sbt-client",
     mimaPreviousArtifacts := Set.empty,