Setup versions for 3.5.0 (#20048)

Author: nicolasstucki

project/Build.scala

@@ -83,7 +83,7 @@ object DottyJSPlugin extends AutoPlugin {
 object Build {
   import ScaladocConfigs._
 
-  val referenceVersion = "3.4.0"
+  val referenceVersion = "3.4.2-RC1"
 
   val baseVersion = "3.5.0-RC1"
 
@@ -104,7 +104,7 @@ object Build {
    *  set to 3.1.3. If it is going to be 3.1.0, it must be set to the latest
    *  3.0.x release.
    */
-  val previousDottyVersion = "3.4.0"
+  val previousDottyVersion = "3.4.1"
 
   /** Version against which we check binary compatibility. */
   val ltsDottyVersion = "3.3.0"