Update sbt-scalafmt to 2.5.5

Author: scala-steward

project/plugins.sbt

@@ -4,6 +4,6 @@ addDependencyTreePlugin
 addSbtPlugin("com.timushev.sbt"          % "sbt-updates"   % "0.6.4")
 //addSbtPlugin("io.github.davidgregory084" % "sbt-tpolecat"  % "0.1.8")
 // sbt scalafmtAll
-addSbtPlugin("org.scalameta"             % "sbt-scalafmt"  % "2.5.2")
+addSbtPlugin("org.scalameta"             % "sbt-scalafmt"  % "2.5.5")
 // sbt clean coverage test coverageReport
 addSbtPlugin("org.scoverage"             % "sbt-scoverage" % "2.2.2")