Update scala-library to 2.13.16 (#14)

Co-authored-by: Mateusz Kubuszok <[email protected]>

Author: scala-steward

build.sbt

@@ -22,7 +22,7 @@ ciRelease := {
 
 val versions = new {
   val scala212 = "2.12.20"
-  val scala213 = "2.13.15"
+  val scala213 = "2.13.16"
   val scala3 = "3.3.5"
 
   // Which versions should be cross-compiled for publishing