Log Message:
www/ruby-rails60: update to 6.0.3.6

Real changes are in devel/ruby-activestorage60 only.

## Rails 6.0.3.6 (March 26, 2021) ##

*   Marcel is upgraded to version 1.0.0 to avoid a dependency on GPL-licensed
    mime types data.

    *George Claghorn*