Spec fails since GraphQL test server has gone away

[fonglh]

spec/lib/base_spec.rb:38 # SlsAdf::Base.execute_query returns the correct response fails.

The graphql URL is set at

sls_adf/spec/support/configuration_helper.rb

Line 5 in 4e07941

c.graphql_url = 'https://p0nmxpxpx0.lp.gql.zone/graphql'

for specs. However, the service has been discontinued, so no data is returned.