Update sbt-dotty to 0.5.5

Author: 47erbot

project/plugins.sbt

@@ -10,4 +10,4 @@ addSbtPlugin("com.alejandrohdezma"  % "sbt-github-header"        % "0.9.2")
 addSbtPlugin("com.alejandrohdezma"  % "sbt-github-mdoc"          % "0.9.2")
 addSbtPlugin("com.alejandrohdezma"  % "sbt-mdoc-toc"             % "0.3.0")
 addSbtPlugin("com.alejandrohdezma"  % "sbt-remove-test-from-pom" % "0.1.0")
-addSbtPlugin("ch.epfl.lamp"         % "sbt-dotty"                % "0.5.4")
+addSbtPlugin("ch.epfl.lamp"         % "sbt-dotty"                % "0.5.5")