Update scala3-library to 3.6.4

Author: scala-steward

project/ScalaVersions.scala

@@ -2,7 +2,7 @@ object ScalaVersions {
   val scala211 = "2.11.12"
   val scala212 = "2.12.20"
   val scala213 = "2.13.16"
-  val scala3   = "3.6.3"
+  val scala3   = "3.6.4"
 
   def allScalaVersions(excluding: String => Boolean = _ => false): List[String] =
     List(scala211, scala212, scala213, scala3).filterNot(excluding)