Update sbt-updates to 0.6.4 (#623)

Author: scala-steward

project/plugins.sbt

@@ -6,6 +6,6 @@ addSbtPlugin("com.sksamuel.scapegoat" %% "sbt-scapegoat"             % "1.2.2")
 addSbtPlugin("ch.epfl.scala"           % "sbt-scalafix"              % "0.11.1")
 addSbtPlugin("com.eed3si9n"            % "sbt-assembly"              % "2.1.5")
 addSbtPlugin("org.typelevel"           % "sbt-tpolecat"              % "0.5.0")
-addSbtPlugin("com.timushev.sbt"        % "sbt-updates"               % "0.6.3")
+addSbtPlugin("com.timushev.sbt"        % "sbt-updates"               % "0.6.4")
 addSbtPlugin("org.scala-js"            % "sbt-scalajs"               % "1.13.2")
 addSbtPlugin("org.portable-scala"      % "sbt-scalajs-crossproject"  % "1.3.2")