bump: Downgrade sbt-scalafix to work with Scala 2.13.15 (akka#4477)

Author: johanandren

.scala-steward.conf

@@ -24,4 +24,6 @@ updates.pin = [
   { groupId = "org.specs2", artifactId = "specs2-core", version = "4.10." },
   # https://github.com/akka/akka-http/pull/4080#issuecomment-1074853622
   { groupId = "com.github.ben-manes.caffeine", artifactId = "caffeine", version = "2.9." },
+  # newer versions require newer Scala version than 2.13.15
+  { groupId = "ch.epfl.scala", artifactId = "sbt-scalafix", version = "0.13."}
 ]

project/plugins.sbt

@@ -15,7 +15,7 @@ addSbtPlugin("com.lightbend.sbt" % "sbt-bill-of-materials" % "1.0.2")
 addSbtPlugin("io.akka" % "sbt-paradox-akka" % "24.10.7")
 addSbtPlugin("de.heikoseeberger" % "sbt-header" % "5.10.0")
 addSbtPlugin("net.bzzt" % "sbt-reproducible-builds" % "0.32")
-addSbtPlugin("ch.epfl.scala" % "sbt-scalafix" % "0.12.1")
+addSbtPlugin("ch.epfl.scala" % "sbt-scalafix" % "0.13.0")
 addSbtPlugin("com.github.sbt" % "sbt-ci-release" % "1.9.2")
 addSbtPlugin("com.github.sbt" % "sbt-pull-request-validator" % "2.0.0")