pdsh: move to boneyard

Closes Homebrew/homebrew#41061.

Signed-off-by: Dominyk Tiller <dominyktiller@gmail.com>

Library/Homebrew/tap_migrations.rb

@@ -156,6 +156,7 @@ TAP_MIGRATIONS = {
   "pdfjam" => "homebrew/tex",
   "pdf2image" => "homebrew/x11",
   "pdftoipe" => "homebrew/head-only",
+  "pdsh" => "homebrew/boneyard",
   "pebble-sdk" => "pebble/pebble-sdk",
   "pgplot" => "homebrew/x11",
   "pixie" => "homebrew/x11",