Update scala-library to 2.13.16 (fun-stack#313)

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

Author: scala-steward

.github/workflows/build.yml

@@ -10,7 +10,7 @@ jobs:
   build:
     strategy:
       matrix:
-        scalaVersion: ["2.13.15"]
+        scalaVersion: ["2.13.16"]
     runs-on: ubuntu-20.04
 
     steps:
@@ -71,7 +71,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-20.04]
-        scala: [2.13.15]
+        scala: [2.13.16]
         java: [adopt@1.8]
     runs-on: ${{ matrix.os }}
     steps:

build.sbt

@@ -3,7 +3,7 @@ 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/fun-stack-scala")),
     scmInfo                := Some(