Remove canonical-rails from Gemfile
Remove canonical-rails from Gemfile

The canonical-rails was locked down to 0.2.9 because Solidus still used
the whitelisted_attributes method but with the new version 0.2.10 it
was renamed to allowed_parameters and it can be removed.

solidusio-contrib/solidus_subscriptions,solidusio-contrib/solidus_subscriptions,solidusio-contrib/solidus_subscriptions,solidusio-contrib/solidus_subscriptions