Log Message:
databases/ruby-awesome_nested_set: update to 3.2.0

Update ruby-awesome_nested_set to 3.2.0.

pkgsrc change: allow any rails version to depends on.

3.2.0
* Add support for Rails 6.0 [Stefan Andersen](https://github.com/stfnndrsn)
  and [Damian Legawiec](https://github.com/damianlegawiec) and
  [Jonathan Tapia](https://github.com/jtapia) and
  [Alex](https://github.com/a-ta-ta)