Merge pull request #487 from scala-steward/update/sbt-mdoc-2.2.15

Update sbt-mdoc to 2.2.15

Author: bplommer

project/plugins.sbt

@@ -3,7 +3,7 @@ addSbtPlugin("com.eed3si9n" % "sbt-unidoc" % "0.4.3")
 addSbtPlugin("com.geirsson" % "sbt-ci-release" % "1.5.5")
 addSbtPlugin("com.typesafe" % "sbt-mima-plugin" % "0.8.1")
 addSbtPlugin("de.heikoseeberger" % "sbt-header" % "5.6.0")
-addSbtPlugin("org.scalameta" % "sbt-mdoc" % "2.2.14")
+addSbtPlugin("org.scalameta" % "sbt-mdoc" % "2.2.15")
 addSbtPlugin("org.scalameta" % "sbt-scalafmt" % "2.4.2")
 addSbtPlugin("ch.epfl.lamp" % "sbt-dotty" % "0.5.1")
 addSbtPlugin("com.codecommit" % "sbt-github-actions" % "0.9.5")