Update scala-library to 2.13.16

Author: scala-steward

.github/workflows/build.yml

@@ -9,7 +9,7 @@ jobs:
   build:
     strategy:
       matrix:
-        scalaVersion: ["2.12.20", "2.13.15", "3.4.1"]
+        scalaVersion: ["2.12.20", "2.13.16", "3.4.1"]
     runs-on: ubuntu-latest
 
     steps:

build.sbt

@@ -3,7 +3,7 @@ inThisBuild(Seq(
 
   scalaVersion := "2.12.20",
 
-  crossScalaVersions := Seq("2.12.20", "2.13.15", "3.3.4"),
+  crossScalaVersions := Seq("2.12.20", "2.13.16", "3.3.4"),
 
   licenses := Seq("MIT License" -> url("https://opensource.org/licenses/MIT")),