Bump Scala 3 Next RC to 3.7.4-RC3 (#3928)

Author: Gedochao

project/deps/package.mill.scala

@@ -17,9 +17,9 @@ object Scala {
   def scala3NextPrefix = "3.7"
   def scala3Next       = s"$scala3NextPrefix.3" // the newest/next version of Scala
   def scala3NextAnnounced = scala3Next // the newest/next version of Scala that's been announced
-  def scala3NextRc          = s"$scala3NextPrefix.4-RC1" // the latest RC version of Scala Next
+  def scala3NextRc          = s"$scala3NextPrefix.4-RC3" // the latest RC version of Scala Next
   def scala3NextRcAnnounced =
-    s"$scala3NextPrefix.3-RC3" // the latest announced RC version of Scala Next
+    s"$scala3NextPrefix.4-RC1" // the latest announced RC version of Scala Next
 
   // The Scala version used to build the CLI itself.
   def defaultInternal = sys.props.get("scala.version.internal").getOrElse(scala3Lts)