Update scala-compiler, scala-library, ... to 2.13.16

Author: scala-steward-bot

build.sbt

@@ -30,7 +30,7 @@ lazy val notPublish = Seq(
 
 val buildSettings = Seq(
   scalaVersion := "2.11.12",
-  crossScalaVersions := Seq("2.11.12", "2.12.20", "2.13.15"),
+  crossScalaVersions := Seq("2.11.12", "2.12.20", "2.13.16"),
   resolvers += Resolver.sonatypeRepo("snapshots"),
   resolvers += Resolver.sonatypeRepo("releases"),
   scalacOptions ++= Seq("-deprecation"),