build(deps-dev): update mdoc, sbt-mdoc from 2.8.1 to 2.8.2 (#4009)

Author: scala-steward

packages/metrics-scala/project/plugins.sbt

@@ -1,6 +1,6 @@
 addSbtPlugin("com.github.sbt" % "sbt-pgp" % "2.3.1")
 
-addSbtPlugin("org.scalameta" % "sbt-mdoc" % "2.8.1")
+addSbtPlugin("org.scalameta" % "sbt-mdoc" % "2.8.2")
 
 addSbtPlugin("org.typelevel" % "sbt-tpolecat" % "0.5.2")