Update scala-library, scala-reflect to 2.13.15 (#211)

Co-authored-by: scala-steward-asf[bot] <147768647+scala-steward-asf[bot]@users.noreply.github.com>

Author: scala-steward-asf[bot]

project/Dependencies.scala

@@ -14,7 +14,7 @@ import sbt._
 
 object Dependencies {
 
-  val Scala213 = "2.13.14"
+  val Scala213 = "2.13.15"
   val Scala212 = "2.12.20"
   val Scala3 = "3.3.3"
   val ScalaVersions = Seq(Scala213, Scala212, Scala3)