Update sbt-ci-release to 1.9.3 (scalapb#307)

Author: scala-steward

project/plugins.sbt

@@ -2,7 +2,7 @@ addSbtPlugin("org.scala-js" % "sbt-scalajs" % "1.17.0")
 
 addSbtPlugin("ch.epfl.scala" % "sbt-scalajs-bundler" % "0.21.1")
 
-addSbtPlugin("com.github.sbt" % "sbt-ci-release" % "1.9.0")
+addSbtPlugin("com.github.sbt" % "sbt-ci-release" % "1.9.3")
 
 addSbtPlugin("org.scalameta" % "sbt-scalafmt" % "2.5.2")