"Ruby Sass has reached end-of-life and should no longer be used." message seen from install-badge-dev-env

[TonyLHansen]

Post-install message from ruby-graphviz:
. . .
Ruby Sass has reached end-of-life and should no longer be used.

• If you use Sass as a command-line tool, we recommend using Dart Sass, the new
  primary implementation: https://sass-lang.com/install

• If you use Sass as a plug-in for a Ruby web framework, we recommend using the
  sassc gem: https://github.com/sass/sassc-ruby#readme

• For more details, please refer to the Sass blog:
  https://sass-lang.com/blog/posts/7828841