Update sbt-scalajs-crossproject to 1.2.0

[scala-steward]

Updates org.portable-scala:sbt-scalajs-crossproject from 1.1.0 to 1.2.0.
GitHub Release Notes - Version Diff

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

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Files still referring to the old version number

The following files still refer to the old version number (1.1.0).
You might want to review and update them manually.

CHANGELOG.md
project/plugins.sbt

Ignore future updates

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

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

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