Update sbt-ci-release to 1.9.3 (#1361)

Author: scala-steward

project/plugins.sbt

@@ -1,5 +1,5 @@
 addSbtPlugin("com.eed3si9n"       % "sbt-buildinfo"                 % "0.13.1")
-addSbtPlugin("com.github.sbt"     % "sbt-ci-release"                % "1.9.2")
+addSbtPlugin("com.github.sbt"     % "sbt-ci-release"                % "1.9.3")
 addSbtPlugin("com.github.cb372"   % "sbt-explicit-dependencies"     % "0.3.1")
 addSbtPlugin("com.typesafe"       % "sbt-mima-plugin"               % "1.1.4")
 addSbtPlugin("de.heikoseeberger"  % "sbt-header"                    % "5.10.0")