Update scala3-library to 3.6.4 (#208)

Author: scala-steward

project/ScalaVer.scala

@@ -10,7 +10,7 @@ object ScalaVer {
 
   final case object _213 extends ScalaVer("2.13.16")
 
-  final case object _300 extends ScalaVer("3.6.3")
+  final case object _300 extends ScalaVer("3.6.4")
 
   val values: Seq[ScalaVer] = Set(_211, _212, _213, _300).toSeq