Update sbt-typelevel, sbt-typelevel-site to 0.6.1 (#553)

Co-authored-by: typelevel-steward[bot] <106827141+typelevel-steward[bot]@users.noreply.github.com>

Author: typelevel-steward[bot]

project/plugins.sbt

@@ -3,5 +3,5 @@ addSbtPlugin("org.scala-native" % "sbt-scala-native" % "0.4.16")
 addSbtPlugin("org.scala-js" % "sbt-scalajs" % "1.14.0")
 addSbtPlugin("org.scoverage" % "sbt-scoverage" % "2.0.9")
 addSbtPlugin("pl.project13.scala" % "sbt-jmh" % "0.4.6")
-addSbtPlugin("org.typelevel" % "sbt-typelevel" % "0.6.0")
-addSbtPlugin("org.typelevel" % "sbt-typelevel-site" % "0.6.0")
+addSbtPlugin("org.typelevel" % "sbt-typelevel" % "0.6.1")
+addSbtPlugin("org.typelevel" % "sbt-typelevel-site" % "0.6.1")