Update GOV.UK toolkit and template

- https://github.com/alphagov/govuk_template/compare/v0.8.0...v0.8.1
- https://github.com/alphagov/govuk_frontend_toolkit/compare/9248f820e8a416070928d16fd71260198c6c681d...e295f45f59495f8e37e37a105da6d9d8b2695a54