Update scalac-scapegoat-plugin to 3.0.0 (#195)

Co-authored-by: scala-steward <162267+scala-steward-for-moia[bot]@users.noreply.github.com>

build.sbt

@@ -154,7 +154,7 @@ lazy val sbtSettings = Seq(cancelable in Global := true)
 
 lazy val scalaFmtSettings = Seq(scalafmtOnCompile := true)
 
-lazy val scapegoatSettings = Seq(ThisBuild / scapegoatVersion := "2.1.6")
+lazy val scapegoatSettings = Seq(ThisBuild / scapegoatVersion := "3.0.0")
 
 lazy val sbtVersionRegex = "v([0-9]+.[0-9]+.[0-9]+)-?(.*)?".r