Update sbt-scalafmt to 2.5.5

Author: scala-steward

project/plugins.sbt

@@ -2,5 +2,5 @@ addSbtPlugin("com.github.sbt"            % "sbt-ci-release"   % "1.5.11")
 addSbtPlugin("org.scoverage"             % "sbt-scoverage"    % "2.0.7")
 addSbtPlugin("com.timushev.sbt"          % "sbt-updates"      % "0.4.2")
 addSbtPlugin("io.github.davidgregory084" % "sbt-tpolecat"     % "0.4.2")
-addSbtPlugin("org.scalameta"             % "sbt-scalafmt"     % "2.5.0")
+addSbtPlugin("org.scalameta"             % "sbt-scalafmt"     % "2.5.5")
 addSbtPlugin("com.github.sbt"            % "sbt-site-paradox" % "1.5.0-RC2")