Update reference version to 3.4.0-RC1 (#19473)

Part of #19321

Author: Kordyjan

project/Build.scala

@@ -83,7 +83,7 @@ object DottyJSPlugin extends AutoPlugin {
 object Build {
   import ScaladocConfigs._
 
-  val referenceVersion = "3.3.1"
+  val referenceVersion = "3.4.0-RC1"
 
   val baseVersion = "3.4.1-RC1"
 

sjs-compiler-tests/test/scala/dotty/tools/dotc/ScalaJSLink.scala

@@ -45,7 +45,7 @@ object ScalaJSLink:
     val result = PathIRContainer
       .fromClasspath(cpEntries.toSeq.map(entry => new File(entry).toPath()))
       .map(_._1)
-      .flatMap(cache.cached _)
+      .flatMap(cache.cached)
       .flatMap(linker.link(_, moduleInitializers, PathOutputDirectory(dir), logger))
 
     val report = Await.result(result, Duration.Inf)