Bump cookie and @x-govuk/govuk-prototype-components in /guide

Removes [cookie](https://github.com/jshttp/cookie). It's no longer used after updating ancestor dependency [@x-govuk/govuk-prototype-components](https://github.com/x-govuk/govuk-prototype-components). These dependencies need to be updated together.


Removes `cookie`

Updates `@x-govuk/govuk-prototype-components` from 3.0.6 to 3.0.9
- [Release notes](https://github.com/x-govuk/govuk-prototype-components/releases)
- [Commits](x-govuk/govuk-prototype-components@v3.0.6...v3.0.9)

---
updated-dependencies:
- dependency-name: cookie
  dependency-type: indirect
- dependency-name: "@x-govuk/govuk-prototype-components"
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>