Update sbt-ci-release to 1.5.12 (#244)

Author: scala-steward

project/plugins.sbt

@@ -2,7 +2,7 @@ addSbtPlugin("org.scoverage" % "sbt-scoverage" % "2.0.7")
 
 addSbtPlugin("org.typelevel" % "sbt-typelevel-sonatype-ci-release" % "0.5.0-M10")
 
-addSbtPlugin("com.github.sbt" % "sbt-ci-release" % "1.5.11")
+addSbtPlugin("com.github.sbt" % "sbt-ci-release" % "1.5.12")
 
 addSbtPlugin("org.scalameta" % "sbt-scalafmt" % "2.5.0")