Merge pull request #3316 from typelevel/update/sbt-mdoc-2.3.8

Update sbt-mdoc to 2.3.8

Author: mpilquist

project/plugins.sbt

@@ -6,4 +6,4 @@ addSbtPlugin("org.scala-native" % "sbt-scala-native" % "0.4.16")
 addSbtPlugin("com.armanbilge" % "sbt-scala-native-config-brew-github-actions" % "0.2.0-RC1")
 addSbtPlugin("com.github.tkawachi" % "sbt-doctest" % "0.10.0")
 addSbtPlugin("pl.project13.scala" % "sbt-jmh" % "0.4.6")
-addSbtPlugin("org.scalameta" % "sbt-mdoc" % "2.3.7")
+addSbtPlugin("org.scalameta" % "sbt-mdoc" % "2.3.8")