Merge pull request #381 from scala-steward/update/scala-library-2.13.15

Update scala-library to 2.13.15

build.sbt

@@ -4,7 +4,7 @@ val Versions = new {
   val discipline = "2.3.0"
   val scalaTestPlus = "3.2.19.0"
 
-  val scala213 = "2.13.14"
+  val scala213 = "2.13.15"
   val scala3 = "3.3.4"
 
   val scalaVersions = Seq(scala213, scala3)