Update sbt-typelevel, sbt-typelevel-site to 0.8.7

Author: typelevel-steward[bot]

project/plugins.sbt

@@ -2,5 +2,5 @@ addSbtPlugin("org.scala-js" % "sbt-scalajs" % "1.22.0")
 addSbtPlugin("org.portable-scala" % "sbt-scalajs-crossproject" % "1.3.2")
 addSbtPlugin("org.scala-native" % "sbt-scala-native" % "0.5.12")
 addSbtPlugin("org.portable-scala" % "sbt-scala-native-crossproject" % "1.3.2")
-addSbtPlugin("org.typelevel" % "sbt-typelevel" % "0.8.6")
-addSbtPlugin("org.typelevel" % "sbt-typelevel-site" % "0.8.6")
+addSbtPlugin("org.typelevel" % "sbt-typelevel" % "0.8.7")
+addSbtPlugin("org.typelevel" % "sbt-typelevel-site" % "0.8.7")