Update sbt-scalafix from 0.14.3 to 0.14.4 (#790)

Author: scala-steward

project/plugins.sbt

@@ -1,5 +1,5 @@
 addSbtPlugin("org.scalameta" % "sbt-scalafmt" % "2.5.5")
-addSbtPlugin("ch.epfl.scala" % "sbt-scalafix" % "0.14.3")
+addSbtPlugin("ch.epfl.scala" % "sbt-scalafix" % "0.14.4")
 addSbtPlugin("ch.epfl.scala" % "sbt-missinglink" % "0.3.6")
 addSbtPlugin("com.typesafe" % "sbt-mima-plugin" % "1.1.4")
 addSbtPlugin("io.github.davidgregory084" % "sbt-tpolecat" % "0.4.4")