Bump govuk frontend toolkit to 4.11.0
Bump govuk frontend toolkit to 4.11.0

# 4.11.0

- Remove the GDS-Logo font-face definition (PR #272)
- Move the @viewport statements to govuk_template (PR #272). If you
upgrade to this version of govuk_frontend_toolkit and you’re also using
govuk_template you’ll need to upgrade that to at least 0.17.2 to
maintain compatibility with desktop IE10 in snap mode.

joelanman/govuk_elements,gavboulton/govuk_elements,gavboulton/govuk_elements,gavboulton/govuk_elements,joelanman/govuk_elements,alphagov/govuk_elements,alphagov/govuk_elements,alphagov/govuk_elements,gavboulton/govuk_elements,alphagov/govuk_elements