Update sbt-typelevel, sbt-typelevel-site to 0.8.1

Author: typelevel-steward[bot]

project/plugins.sbt

@@ -4,6 +4,6 @@ addSbtPlugin("org.scala-native" % "sbt-scala-native" % "0.5.8")
 addSbtPlugin("org.scalameta" % "sbt-mdoc" % "2.6.2")
 addSbtPlugin("org.scalameta" % "sbt-scalafmt" % "2.5.5")
 addSbtPlugin("org.scoverage" % "sbt-scoverage" % "2.3.1")
-addSbtPlugin("org.typelevel" % "sbt-typelevel" % "0.8.0")
-addSbtPlugin("org.typelevel" % "sbt-typelevel-site" % "0.8.0")
+addSbtPlugin("org.typelevel" % "sbt-typelevel" % "0.8.1")
+addSbtPlugin("org.typelevel" % "sbt-typelevel-site" % "0.8.1")
 addSbtPlugin("pl.project13.scala" % "sbt-jmh" % "0.4.7")