Update scala3-library to 3.3.8

Author: typelevel-steward[bot]

build.sbt

@@ -15,7 +15,7 @@ ThisBuild / developers := List(
 ThisBuild / tlSitePublishBranch := Some("main")
 
 val Scala213 = "2.13.16"
-ThisBuild / crossScalaVersions := Seq(Scala213, "3.3.6")
+ThisBuild / crossScalaVersions := Seq(Scala213, "3.3.8")
 ThisBuild / scalaVersion := Scala213 // the default Scala
 
 lazy val root = tlCrossRootProject.aggregate(core, mtl, testkit, circe)