Merge pull request #199 from scala-steward/update/sbt-scalajs-1.20.1

Update sbt-scalajs, scalajs-library_2.13, ... to 1.20.1

Author: frawa

project/plugins.sbt

@@ -1,5 +1,5 @@
 addSbtPlugin("com.eed3si9n"      % "sbt-projectmatrix"   % "0.11.0")
-addSbtPlugin("org.scala-js"      % "sbt-scalajs"         % "1.19.0")
+addSbtPlugin("org.scala-js"      % "sbt-scalajs"         % "1.20.1")
 addSbtPlugin("org.scalameta"     % "sbt-scalafmt"        % "2.5.4")
 addSbtPlugin("ch.epfl.scala"     % "sbt-scalafix"        % "0.14.3")
 addSbtPlugin("de.heikoseeberger" % "sbt-header"          % "5.10.0")