ScalaSteward: Update mdoc, sbt-mdoc from 2.6.5 to 2.7.1

Author: scala-steward

project/plugins.sbt

@@ -2,6 +2,6 @@ logLevel := Level.Warn
 
 addSbtPlugin("com.github.sbt"                    % "sbt-ci-release"   % "1.9.3")
 addSbtPlugin("org.scalameta"                     % "sbt-scalafmt"     % "2.5.4")
-addSbtPlugin("org.scalameta"                     % "sbt-mdoc"         % "2.6.5")
+addSbtPlugin("org.scalameta"                     % "sbt-mdoc"         % "2.7.1")
 addSbtPlugin("org.scoverage"                     % "sbt-scoverage"    % "2.3.1")
 addSbtPlugin("com.thoughtworks.sbt-api-mappings" % "sbt-api-mappings" % "3.0.2")