Update scalajs-dom to 2.8.0

[FabioPinheiro]

About this PR

📦 Updates org.scala-js:scalajs-dom from 2.6.0 to 2.8.0

📜 GitHub Release Notes - Version Diff

Usage

✅ Please merge!

I'll automatically update this PR to resolve conflicts as long as you don't change it yourself.

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⚙ Adjust future updates

Add this to your .scala-steward.conf file to ignore future updates of this dependency:

updates.ignore = [ { groupId = "org.scala-js", artifactId = "scalajs-dom" } ]

Or, add this to slow down future updates of this dependency:

dependencyOverrides = [{
  pullRequests = { frequency = "30 days" },
  dependency = { groupId = "org.scala-js", artifactId = "scalajs-dom" }
}]

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

[FabioPinheiro]

Need to remove duplicated code after PR scala-js/scala-js-dom#808 been merged.
The other PR as some pending comments scala-js/scala-js-dom#806