Update scala-library to 2.13.16 (#151)

Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

Author: scala-steward

build.sbt

@@ -5,7 +5,7 @@ Global / onChangedBuildSource := ReloadOnSourceChanges
 inThisBuild(
   Seq(
     organization           := "io.github.fun-stack",
-    scalaVersion           := "2.13.15",
+    scalaVersion           := "2.13.16",
     licenses               := Seq("MIT License" -> url("https://opensource.org/licenses/MIT")),
     homepage               := Some(url("https://github.com/fun-stack/local-env")),
     scmInfo                := Some(