Bump govuk_template to latest version

The new version contains:

- Cookie bar above header
- The blue brand bar on every page by default
- New widths on the footer

Updated the footer padding to compensate for the new footer width and
removed the border on the breadcrumbs to no end up with a double colour
bar at the top of the page.

This shouldn't be merged until the following pull requests have been merged (and possibly deployed):

- [ ] [whitehall](https://github.com/alphagov/whitehall/pull/1484)
- [ ] [frontend](https://github.com/alphagov/frontend/pull/603)
- [ ] [limelight](https://github.com/alphagov/limelight/pull/264)