Update sbt-dotty to 0.4.6

Author: scala-steward

project/plugins.sbt

@@ -7,6 +7,6 @@ val sbtSoftwareMillVersion = "1.9.14"
 addSbtPlugin("com.softwaremill.sbt-softwaremill" % "sbt-softwaremill-common" % sbtSoftwareMillVersion)
 addSbtPlugin("com.softwaremill.sbt-softwaremill" % "sbt-softwaremill-publish" % sbtSoftwareMillVersion)
 
-addSbtPlugin("ch.epfl.lamp" % "sbt-dotty" % "0.4.5")
+addSbtPlugin("ch.epfl.lamp" % "sbt-dotty" % "0.4.6")
 
 addSbtPlugin("org.jetbrains" % "sbt-ide-settings" % "1.1.0")