pup 0.3.1 (new formula)

Taking inspiration from the structure provided by
Library/Forumla/terraform.rb this forumla builds the `pup` html query
utility.
pup: add 0.3.1 bottle.

Closes #33128.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
pup: use double-quotes.