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

Author: typelevel-steward[bot]

project/plugins.sbt

@@ -3,8 +3,8 @@ ThisBuild / libraryDependencySchemes ++= Seq(
   "org.scala-lang.modules" %% "scala-xml" % VersionScheme.Always
 )
 
-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")
 addSbtPlugin("com.timushev.sbt"   % "sbt-updates"                                 % "0.7.0")
 addSbtPlugin("pl.project13.scala" % "sbt-jmh"                                     % "0.4.8")
 addSbtPlugin("org.scoverage"      % "sbt-scoverage"                               % "2.4.4")