Update sbt-scalajs to 1.18.2

Author: http4s-steward[bot]

project/plugins.sbt

@@ -1,4 +1,4 @@
 addSbtPlugin("org.http4s" % "sbt-http4s-org" % "0.14.11")
-addSbtPlugin("org.scala-js" % "sbt-scalajs" % "1.13.0")
+addSbtPlugin("org.scala-js" % "sbt-scalajs" % "1.18.2")
 addSbtPlugin("org.scala-native" % "sbt-scala-native" % "0.4.12")
 addSbtPlugin("org.portable-scala" % "sbt-scala-native-crossproject" % "1.3.0")