Update Ruby on Rails to 6.0.3.2.
www/ruby-actionpack60 is the really updated package and other packages
have no change except version.
CHANGELOG of www/ruby-actionpack60 is here:
## Rails 6.0.3.2 (June 17, 2020) ##
* [CVE-2020-8185] Only allow ActionableErrors if
show_detailed_exceptions is enabled