Set SOLIDUS_RAISE_DEPRECATIONS in circle.yml
Set SOLIDUS_RAISE_DEPRECATIONS in circle.yml

This was previously set in our CircleCI project config, but this didn't
work when users enabled CircleCI on their own forks (as it would use
their settings for environment variables).

This ensures that we will always be testing with
SOLIDUS_RAISE_DEPRECATIONS

pervino/solidus,pervino/solidus,pervino/solidus,pervino/solidus