Update scala-library to 2.13.9

Author: typelevel-steward[bot]

.github/workflows/ci.yml

@@ -28,7 +28,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        scala: [2.12.17, 2.13.8, 3.1.3]
+        scala: [2.12.17, 2.13.9, 3.1.3]
         java: [temurin@8]
         project: [rootJS, rootJVM]
     runs-on: ${{ matrix.os }}

build.sbt

@@ -13,7 +13,7 @@ ThisBuild / developers := List(
 ThisBuild / tlSonatypeUseLegacyHost := false
 
 val Scala212 = "2.12.17"
-val Scala213 = "2.13.8"
+val Scala213 = "2.13.9"
 val Scala3   = "3.1.3"
 
 ThisBuild / scalaVersion := Scala212 // The default while sbt is still based on Scala 2.12.x