Update sbt-scalafmt to 2.5.5

Author: scala-steward

project/plugins.sbt

@@ -12,6 +12,6 @@ addSbtPlugin("io.github.davidgregory084" % "sbt-tpolecat" % "0.3.1")
 
 addSbtPlugin("ch.epfl.scala" % "sbt-scalafix" % "0.10.0")
 
-addSbtPlugin("org.scalameta" % "sbt-scalafmt" % "2.4.6")
+addSbtPlugin("org.scalameta" % "sbt-scalafmt" % "2.5.5")
 
 addSbtPlugin("com.github.sbt" % "sbt-ci-release" % "1.5.12")