Bump paas-billing to v0.66.0 (timing for /totals)
Bump paas-billing to v0.66.0 (timing for /totals)

See https://github.com/alphagov/paas-billing/compare/v0.65.0...v0.66.0

alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf