Update sbt-scala-native to 0.4.0

[scala-steward]

Updates org.scala-native:sbt-scala-native from 0.3.9 to 0.4.0.

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

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Ignore future updates

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

updates.ignore = [ { groupId = "org.scala-native", artifactId = "sbt-scala-native" } ]

labels: sbt-plugin-update, semver-minor

[larsrh]

I was surprised that this builds, but turns out that tests aren't compiled for native in the workflow.