Update scala3-library to 3.3.6

Author: scala-steward-bot

build.sbt

@@ -6,7 +6,7 @@ lazy val root = (project in file(".")).settings(
   name := "scalamd",
   version := "1.8.0",
   scalaVersion := Scala212,
-  crossScalaVersions := Seq(Scala212, "2.11.12", "2.10.7", "2.13.16", "3.3.5"),
+  crossScalaVersions := Seq(Scala212, "2.11.12", "2.10.7", "2.13.16", "3.3.6"),
   transitiveClassifiers in Global := Seq(Artifact.SourceClassifier),
   scalacOptions ++= Seq("-unchecked", "-deprecation", "-feature"),
   scalatestVersion := "3.2.19",