Update sbt-mdoc to 2.5.4

Author: scala-steward

project/plugins.sbt

@@ -5,7 +5,7 @@ addSbtPlugin("com.geirsson"              % "sbt-ci-release"            % "1.5.7"
 addSbtPlugin("com.github.cb372"          % "sbt-explicit-dependencies" % "0.2.16")
 addSbtPlugin("io.github.davidgregory084" % "sbt-tpolecat"              % "0.1.17")
 addSbtPlugin("net.vonbuchholtz"          % "sbt-dependency-check"      % "3.1.1")
-addSbtPlugin("org.scalameta"             % "sbt-mdoc"                  % "2.2.18")
+addSbtPlugin("org.scalameta"             % "sbt-mdoc"                  % "2.5.4")
 addSbtPlugin("org.scalameta"             % "sbt-scalafmt"              % "2.4.2")
 addSbtPlugin("org.scalastyle"           %% "scalastyle-sbt-plugin"     % "1.0.0")
 addSbtPlugin("org.wartremover"           % "sbt-wartremover"           % "2.4.13")