Merge pull request #437 from scala-steward/update/sbt-dotty-0.5.5

Update sbt-dotty to 0.5.5

Author: mergify[bot]

project/plugins.sbt

@@ -7,4 +7,4 @@ addSbtPlugin("com.timushev.sbt"          % "sbt-updates"    % "0.5.3")
 addSbtPlugin("io.github.davidgregory084" % "sbt-tpolecat"   % "0.1.17")
 addSbtPlugin("org.scalameta"             % "sbt-mdoc"       % "2.2.20")
 addSbtPlugin("org.scoverage"             % "sbt-scoverage"  % "1.6.1")
-addSbtPlugin("ch.epfl.lamp"              % "sbt-dotty"      % "0.5.4")
+addSbtPlugin("ch.epfl.lamp"              % "sbt-dotty"      % "0.5.5")