Update sbt-mima-plugin to 1.1.4 in 0.12.x (#533)

Author: scala-steward

project/plugins.sbt

@@ -3,7 +3,7 @@ addSbtPlugin("com.github.sbt" % "sbt-pgp" % "2.3.1")
 addSbtPlugin("com.thesamet" % "sbt-protoc" % "1.0.8")
 libraryDependencies += "com.thesamet.scalapb" %% "compilerplugin" % "0.11.18"
 
-addSbtPlugin("com.typesafe" % "sbt-mima-plugin" % "1.1.3")
+addSbtPlugin("com.typesafe" % "sbt-mima-plugin" % "1.1.4")
 
 addSbtPlugin("org.scalameta" % "sbt-scalafmt" % "2.5.2")