Update sbt-typelevel-ci-release, ... to 0.4.15

Author: typelevel-steward[bot]

project/plugin.sbt

@@ -3,6 +3,6 @@ addSbtPlugin("org.scala-native" % "sbt-scala-native" % "0.4.5")
 addSbtPlugin("org.portable-scala" % "sbt-scalajs-crossproject" % "1.2.0")
 addSbtPlugin("org.portable-scala" % "sbt-scala-native-crossproject" % "1.2.0")
 addSbtPlugin("pl.project13.scala" % "sbt-jmh" % "0.4.3")
-val sbtTypelevelVersion = "0.4.13"
+val sbtTypelevelVersion = "0.4.15"
 addSbtPlugin("org.typelevel" % "sbt-typelevel-ci-release" % sbtTypelevelVersion)
 addSbtPlugin("org.typelevel" % "sbt-typelevel-settings" % sbtTypelevelVersion)