Update sbt-idea-plugin to 4.1.0 (#342)

Author: scala-steward

project/plugins.sbt

@@ -1,3 +1,3 @@
-addSbtPlugin("org.jetbrains" % "sbt-idea-plugin" % "4.0.3")
+addSbtPlugin("org.jetbrains" % "sbt-idea-plugin" % "4.1.0")
 addSbtPlugin("org.scalameta" % "sbt-scalafmt" % "2.5.4")
 addSbtPlugin("org.typelevel" % "sbt-typelevel" % "0.7.6")