Merge pull request #3452 from scala-steward/update/sbt-ci-release-1.9.0

Update sbt-ci-release to 1.9.0

Author: mergify[bot]

project/plugins.sbt

@@ -1,6 +1,6 @@
 addSbtPlugin("com.eed3si9n" % "sbt-assembly" % "2.3.0")
 addSbtPlugin("com.eed3si9n" % "sbt-buildinfo" % "0.12.0")
-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")
 addSbtPlugin("com.github.cb372" % "sbt-explicit-dependencies" % "0.3.1")
 addSbtPlugin("com.github.tkawachi" % "sbt-doctest" % "0.10.0")