Update sbt-scalajs to 1.13.1

[typelevel-steward[bot]]

Updates org.scala-js:sbt-scalajs from 1.10.0 to 1.13.1. GitHub Release Notes - Version Diff

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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 = "sbt-scalajs" } ] ``` Or, add this to slow down future updates of this dependency: ``` dependencyOverrides = [{ pullRequests = { frequency = "30 days" }, dependency = { groupId = "org.scala-js", artifactId = "sbt-scalajs" } }] ```

labels: sbt-plugin-update, early-semver-minor, semver-spec-minor, commit-count:1

[typelevel-steward[bot]]

Superseded by #601.