Update scala-library to 2.13.16 in scala2 (#648)

Author: scala-steward

build.sbt

@@ -19,8 +19,8 @@ def commonSettings = Seq(
   //isSnapshot := true,
   //publishConfiguration := publishConfiguration.value.withOverwrite(true),
   publishLocalConfiguration := publishLocalConfiguration.value.withOverwrite(true),
-  scalaVersion := "2.13.15",
-  crossScalaVersions := Seq("2.13.15"),
+  scalaVersion := "2.13.16",
+  crossScalaVersions := Seq("2.13.16"),
   pomIncludeRepository := { _ => false },
   publishMavenStyle := true,
   publishTo := {