Update scala3-library to 3.3.8

Author: scala-steward

build.sbt

@@ -17,7 +17,7 @@ val versions = new {
   // Versions we are publishing for.
   val scala212 = "2.12.21"
   val scala213 = "2.13.18"
-  val scala3 = "3.3.7"
+  val scala3 = "3.3.8"
 
   // Which versions should be cross-compiled for publishing.
   val scalas = List(scala212, scala213, scala3)