Use non soon-to-be-deprecated-or-reworked method

sbt-coursier/src/main/scala/coursier/ToSbt.scala

@@ -122,7 +122,7 @@ object ToSbt {
   ) = {
     val depArtifacts1 =
       classifiersOpt match {
-        case None => res.dependencyArtifacts
+        case None => res.dependencyArtifacts(withOptional = true)
         case Some(cl) => res.dependencyClassifiersArtifacts(cl)
       }
 

sbt-shading/src/main/scala/coursier/Shading.scala

@@ -91,7 +91,8 @@ object Shading {
       )
     }
 
-    val dependencyArtifacts = res.dependencyArtifacts
+    val dependencyArtifacts = res
+      .dependencyArtifacts(withOptional = true)
       .filter { case (_, a) => classpathTypes(a.`type`) }
       .groupBy(_._1)
       .mapValues(_.map(_._2))

tests/jvm/src/it/scala/coursier/test/IvyLocalTests.scala

@@ -46,7 +46,7 @@ object IvyLocalTests extends TestSuite {
           extraRepos = extraRepos
         ))
 
-        val artifacts = res.dependencyArtifacts.filter(_._2.`type` == "jar").map(_._2.url)
+        val artifacts = res.dependencyArtifacts(withOptional = true).filter(_._2.`type` == "jar").map(_._2.url)
         val anyJavadoc = artifacts.exists(_.contains("-javadoc"))
         val anySources = artifacts.exists(_.contains("-sources"))