Log Message:
www/ruby-html-proofer: update to 5.0.6

5.0.5 (2023-03-07)

What's Changed

* remove proprietary pdf by @gjtorikian in #790
* Fix cleaning relative links cache key by @riccardoporreca in #793

5.0.6 (2023-03-15)

What's Changed

* Refactor/simplify internal link check resolution by @riccardoporreca in
  #795