Update sbt-scalajs to 1.15.0

Author: scala-steward

build.sbt

@@ -8,6 +8,6 @@ description := "A Sbt plugin that setup source mapping for Scala.js projects hos
 
 startYear := Some(2016)
 
-addSbtPlugin("org.scala-js" % "sbt-scalajs" % "1.13.2")
+addSbtPlugin("org.scala-js" % "sbt-scalajs" % "1.15.0")
 
 libraryDependencies += "org.eclipse.jgit" % "org.eclipse.jgit" % "6.6.0.202305301015-r"