Update sbt-scalajs, scalajs-compiler, ... to 1.9.0

[scala-steward]

Updates

• org.scala-js:sbt-scalajs
• org.scala-js:scalajs-compiler
• org.scala-js:scalajs-junit-test-plugin
• org.scala-js:scalajs-junit-test-runtime
• org.scala-js:scalajs-junit-test-runtime_2.13
• org.scala-js:scalajs-library
• org.scala-js:scalajs-library_2.13
• org.scala-js:scalajs-test-bridge
• org.scala-js:scalajs-test-bridge_2.13

from 1.7.1 to 1.9.0.
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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Ignore future updates

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

[SethTisue]

[error] (parserCombinatorsJS / versionPolicyReportDependencyIssues) Dependencies of module scala-parser-combinators:2.1.0+37-4b8d43e8-SNAPSHOT break the intended compatibility guarantees 'Compatibility.BinaryAndSourceCompatible' (see messages above). You have to relax your compatibility intention by changing the value of versionPolicyIntention.
[53](https://github.com/scala/scala-parser-combinators/runs/5194957565?check_suite_focus=true#step:5:53)

I guess we should relax the intention temporarily to allow the upgrade?