Update sbt-scalajs, scalajs-compiler, ... to 1.21.0

[scala-steward]

About this PR

📦 Updates

• org.scala-js:sbt-scalajs
• org.scala-js:scalajs-compiler
• org.scala-js:scalajs-library
• org.scala-js:scalajs-test-bridge

from 1.20.2 to 1.21.0

📜 GitHub Release Notes - Version Diff

Usage

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^{labels: library-update, early-semver-minor, semver-spec-minor, commit-count:1}

[ddworak]

@halotukozak this needs a careful look at our internal repos due to the change regarding closure compiler.