Update sbt-microsites to 1.4.1

Author: scala-steward

project/plugins.sbt

@@ -1,5 +1,5 @@
 addSbtPlugin("pl.project13.scala" % "sbt-jmh"              % "0.4.3")
-addSbtPlugin("com.47deg"          % "sbt-microsites"       % "1.3.4")
+addSbtPlugin("com.47deg"          % "sbt-microsites"       % "1.4.1")
 addSbtPlugin("org.scalameta"      % "sbt-scalafmt"         % "2.4.6")
 addSbtPlugin("org.scoverage"      % "sbt-scoverage"        % "1.9.3")
 addSbtPlugin("org.scalameta"      % "sbt-mdoc"             % "2.2.24")