Update sbt-scalafmt to 2.5.5 (#279)

Author: scala-steward

project/plugins.sbt

@@ -10,6 +10,6 @@ addSbtPlugin("com.evolution" % "sbt-artifactory-plugin" % "0.0.2")
 
 addSbtPlugin("ch.epfl.scala" % "sbt-version-policy" % "3.2.1")
 
-addSbtPlugin("org.scalameta" % "sbt-scalafmt" % "2.5.4")
+addSbtPlugin("org.scalameta" % "sbt-scalafmt" % "2.5.5")
 
 addDependencyTreePlugin