xar: migrate to dupes

Related: https://github.com/Homebrew/homebrew-dupes/pull/420



Closes Homebrew/homebrew#37588.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>

Library/Homebrew/tap_migrations.rb

@@ -164,6 +164,7 @@ TAP_MIGRATIONS = {
   "wkhtmltopdf" => "homebrew/boneyard",
   "wmctrl" => "homebrew/x11",
   "x3270" => "homebrew/x11",
+  "xar" => "homebrew/dupes",
   "xchat" => "homebrew/x11",
   "xclip" => "homebrew/x11",
   "xdotool" => "homebrew/x11",