fix(package): update govuk_template_jinja to version 0.20.1
fix(package): update govuk_template_jinja to version 0.20.1

0.20.1
- Fix invalid html from Apple touch icons syntax [PR #300](https://github.com/alphagov/govuk_template/pull/300) and
update icon sizes to match Apple specs

alphagov/govuk_elements,alphagov/govuk_elements,alphagov/govuk_elements,alphagov/govuk_elements