Update scala-xml to 2.4.0 (#961)

Author: scala-steward

build.sbt

@@ -96,7 +96,7 @@ def check(code: String) = {
 """
 
 libraryDependencies ++= Seq(
-  "org.scala-lang.modules" %% "scala-xml" % "2.3.0" excludeAll ExclusionRule(organization = "org.scala-lang"),
+  "org.scala-lang.modules" %% "scala-xml" % "2.4.0" excludeAll ExclusionRule(organization = "org.scala-lang"),
   "org.scala-lang.modules" %% "scala-collection-compat" % "2.13.0" excludeAll ExclusionRule(organization =
     "org.scala-lang"
   ),