Update sbt-scalafix to 0.12.0 (#1165)

Co-authored-by: scala-steward-asf[bot] <147768647+scala-steward-asf[bot]@users.noreply.github.com>

Author: scala-steward-asf[bot]

project/plugins.sbt

@@ -12,7 +12,7 @@ addSbtPlugin("com.eed3si9n" % "sbt-assembly" % "2.1.5")
 addSbtPlugin("com.lightbend.sbt" % "sbt-java-formatter" % "0.7.0")
 addSbtPlugin("com.lightbend.sbt" % "sbt-bill-of-materials" % "1.0.2")
 addSbtPlugin("org.scalameta" % "sbt-scalafmt" % "2.5.2")
-addSbtPlugin("ch.epfl.scala" % "sbt-scalafix" % "0.11.1")
+addSbtPlugin("ch.epfl.scala" % "sbt-scalafix" % "0.12.0")
 addSbtPlugin("com.github.sbt" % "sbt-osgi" % "0.10.0")
 addSbtPlugin("com.typesafe" % "sbt-mima-plugin" % "1.1.3")
 addSbtPlugin("com.github.sbt" % "sbt-unidoc" % "0.5.0")