Update sbt-ci-release to 1.9.0 (#372)

Author: scala-steward

project/plugins.sbt

@@ -2,6 +2,6 @@ addSbtPlugin("org.scoverage" % "sbt-scoverage" % "2.2.2")
 
 addSbtPlugin("com.github.sbt" % "sbt-github-actions" % "0.24.0")
 
-addSbtPlugin("com.github.sbt" % "sbt-ci-release" % "1.8.0")
+addSbtPlugin("com.github.sbt" % "sbt-ci-release" % "1.9.0")
 
 addSbtPlugin("org.scalameta" % "sbt-scalafmt" % "2.5.2")