Update sbt to 1.9.0

[typelevel-steward[bot]]

Updates org.scala-sbt:sbt from 1.8.3 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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Have a fantastic day writing Scala!

Adjust future updates

Add this to your `.scala-steward.conf` file to ignore future updates of this dependency: ``` updates.ignore = [ { groupId = "org.scala-sbt", artifactId = "sbt" } ] ``` Or, add this to slow down future updates of this dependency: ``` dependencyOverrides = [{ pullRequests = { frequency = "30 days" }, dependency = { groupId = "org.scala-sbt", artifactId = "sbt" } }] ```

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