Update sbt-scalafmt to 2.4.6

Author: scala-steward

project/plugins.sbt

@@ -1,4 +1,4 @@
 libraryDependencies += "org.scala-sbt" %% "scripted-plugin" % sbtVersion.value
 addSbtPlugin("com.github.sbt" % "sbt-ci-release" % "1.5.10")
 addSbtPlugin("com.eed3si9n" % "sbt-buildinfo" % "0.10.0")
-addSbtPlugin("org.scalameta" % "sbt-scalafmt" % "2.4.3")
+addSbtPlugin("org.scalameta" % "sbt-scalafmt" % "2.4.6")