Bump Scala 3 Next RC to 3.7.3-RC3 (#3854)

Author: Gedochao

project/deps/package.mill.scala

@@ -14,9 +14,9 @@ object Scala {
   def runnerScala3     = scala3Lts
   def scala3NextPrefix = "3.7"
   def scala3Next       = s"$scala3NextPrefix.2" // the newest/next version of Scala
-  def scala3NextAnnounced   = scala3Next   // the newest/next version of Scala that's been announced
-  def scala3NextRc          = "3.7.3-RC2"  // the latest RC version of Scala Next
-  def scala3NextRcAnnounced = scala3NextRc // the latest announced RC version of Scala Next
+  def scala3NextAnnounced   = scala3Next  // the newest/next version of Scala that's been announced
+  def scala3NextRc          = "3.7.3-RC3" // the latest RC version of Scala Next
+  def scala3NextRcAnnounced = "3.7.3-RC2" // 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)