Update scalajs-dom to 2.4.0 (#381)

Author: scala-steward

project/Deps.scala

@@ -14,7 +14,7 @@ object Deps {
   def rhino = "org.mozilla" % "rhino" % "1.7.14"
   def shapeless = setting("com.chuusai" %%% "shapeless" % "2.3.7")
   def scalacheckShapeless = setting("com.github.alexarchambault" %%% "scalacheck-shapeless_1.15" % "1.3.0")
-  def scalajsDom = setting("org.scala-js" %%% "scalajs-dom" % "2.3.0")
+  def scalajsDom = setting("org.scala-js" %%% "scalajs-dom" % "2.4.0")
   def scalatags = setting("com.lihaoyi" %%% "scalatags" % "0.12.0")
   def scalaTest = "org.scalatest" %% "scalatest" % "3.2.14"