Update sbt-scalajs, scalajs-compiler, ... to 1.20.1 (#3680)

Co-authored-by: zio-scala-steward[bot] <145262613+zio-scala-steward[bot]@users.noreply.github.com>
Co-authored-by: Jules Ivanic <jules.ivanic@gmail.com>

Author: zio-scala-steward[bot]

project/plugins.sbt

@@ -10,7 +10,7 @@ addSbtPlugin("de.heikoseeberger"   % "sbt-header"                % "5.10.0")
 addSbtPlugin("org.scoverage"       % "sbt-scoverage"             % "2.3.1")
 addSbtPlugin("io.get-coursier"     % "sbt-shading"               % "2.1.5")
 addSbtPlugin("com.github.cb372"    % "sbt-explicit-dependencies" % "0.3.1")
-addSbtPlugin("org.scala-js"        % "sbt-scalajs"               % "1.19.0")
+addSbtPlugin("org.scala-js"        % "sbt-scalajs"               % "1.20.1")
 addSbtPlugin("org.portable-scala"  % "sbt-scalajs-crossproject"  % "1.3.2")
 addSbtPlugin("com.thesamet"        % "sbt-protoc"                % "1.0.8")
 addSbtPlugin("com.thesamet"        % "sbt-protoc-gen-project"    % "0.1.8")