Update sbt-header to 5.9.0#314

scala-steward wants to merge 2 commits intoReactivePlatform:masterReactivePlatform/Reactive-Design-Patterns:masterfrom

scala-steward:update/sbt-header-5.9.0scala-steward/Reactive-Design-Patterns:update/sbt-header-5.9.0Copy head branch name to clipboard