Update sbt-ci-release to 1.9.1

Author: Indoor Vivants Steward[bot]

project/plugins.sbt

@@ -1,4 +1,4 @@
-addSbtPlugin("com.github.sbt" % "sbt-ci-release" % "1.9.0")
+addSbtPlugin("com.github.sbt" % "sbt-ci-release" % "1.9.1")
 addSbtPlugin("com.eed3si9n" % "sbt-projectmatrix" % "0.9.2")
 addSbtPlugin("org.scalameta" % "sbt-scalafmt" % "2.5.2")
 addSbtPlugin("org.scalameta" % "sbt-mdoc" % "2.3.8")