Update scala-library, scala-reflect to 2.13.15

Author: scala-steward

build.sbt

@@ -2,7 +2,7 @@ import scala.collection.immutable
 
 lazy val V = new {
   val SCALA_2_12 = "2.12.18"
-  val SCALA_2_13 = "2.13.11"
+  val SCALA_2_13 = "2.13.15"
   val SCALA_3 = "3.3.3"
   val Scalas = Seq(SCALA_2_13, SCALA_2_12, SCALA_3)
   val literally = "1.1.0"