Update sbt-ci-release to 1.5.9 (#450)

project/plugins.sbt

 addSbtPlugin("ch.epfl.scala"                     % "sbt-bloop"        % "1.4.10")
 addSbtPlugin("ch.epfl.scala"                     % "sbt-scalafix"     % "0.9.31")
 addSbtPlugin("com.eed3si9n"                      % "sbt-buildinfo"    % "0.10.0")
-addSbtPlugin("com.geirsson"                      % "sbt-ci-release"   % "1.5.7")
+addSbtPlugin("com.github.sbt"                    % "sbt-ci-release"   % "1.5.9")
 addSbtPlugin("com.thoughtworks.sbt-api-mappings" % "sbt-api-mappings" % "3.0.0")
 addSbtPlugin("org.scalameta"                     % "sbt-mdoc"         % "2.2.24")
 addSbtPlugin("org.scalameta"                     % "sbt-scalafmt"     % "2.4.3")