Merge pull request #298 from scala-steward/update/sbt-header-5.11.0

Update sbt-header to 5.11.0

Author: lrytz

project/plugins.sbt

@@ -1,3 +1,3 @@
 addSbtPlugin("com.eed3si9n" % "sbt-assembly" % "2.3.1")
-addSbtPlugin("de.heikoseeberger" % "sbt-header" % "5.10.0")
+addSbtPlugin("com.github.sbt" % "sbt-header" % "5.11.0")
 addSbtPlugin("ch.epfl.scala" % "sbt-scalafix" % "0.14.4")