Update doctest-runtime, sbt-doctest to 0.12.3

Author: dwolla-oss-scala-steward[bot]

project/plugins.sbt

@@ -3,7 +3,7 @@ addSbtPlugin("org.portable-scala" % "sbt-scalajs-crossproject" % "1.3.2")
 addSbtPlugin("org.typelevel" % "sbt-typelevel-ci-release" % "0.8.3")
 addSbtPlugin("org.typelevel" % "sbt-typelevel-settings" % "0.8.3")
 addSbtPlugin("org.typelevel" % "sbt-typelevel-mergify" % "0.8.3")
-addSbtPlugin("io.github.sbt-doctest" % "sbt-doctest" % "0.12.2")
+addSbtPlugin("io.github.sbt-doctest" % "sbt-doctest" % "0.12.3")
 addSbtPlugin("com.eed3si9n" % "sbt-buildinfo" % "0.13.1")
 
 libraryDependencySchemes += "com.lihaoyi" %% "geny" % VersionScheme.Always