Merge pull request #214 from scala-steward/update/sbt-ci-release-1.9.0

bump: sbt-ci-release 1.9.0 (was 1.5.10)

Author: mkurz

project/plugins.sbt

@@ -2,6 +2,6 @@ addSbtPlugin("com.github.sbt" % "sbt-pgp" % "2.3.0")
 addSbtPlugin("org.scalameta" % "sbt-scalafmt" % "2.4.6")
 addSbtPlugin("de.heikoseeberger" % "sbt-header" % "5.7.0")
 addSbtPlugin("com.dwijnand" % "sbt-dynver" % "4.1.1")
-addSbtPlugin("com.github.sbt" % "sbt-ci-release" % "1.5.10")
+addSbtPlugin("com.github.sbt" % "sbt-ci-release" % "1.9.0")
 
 libraryDependencies += "org.scala-sbt" %% "scripted-plugin" % sbtVersion.value