Merge pull request #1132 from scala-steward/update/sbt-ci-release-1.12.0

sbt-ci-release 1.12.0 (was 1.11.2)

Author: mkurz

project/plugins.sbt

@@ -9,4 +9,4 @@ addSbtPlugin("org.playframework" % "play-docs-sbt-plugin" % sys.props.getOrElse(
 addSbtPlugin("org.scalameta" % "sbt-scalafmt"    % "2.6.1")
 addSbtPlugin("com.typesafe"  % "sbt-mima-plugin" % "1.1.6")
 
-addSbtPlugin("com.github.sbt" % "sbt-ci-release" % "1.11.2")
+addSbtPlugin("com.github.sbt" % "sbt-ci-release" % "1.12.0")