Bump @x-govuk/govuk-prototype-components from 3.0.3 to 3.0.4 in /guide

Bumps [@x-govuk/govuk-prototype-components](https://github.com/x-govuk/govuk-prototype-components) from 3.0.3 to 3.0.4.
- [Release notes](https://github.com/x-govuk/govuk-prototype-components/releases)
- [Commits](x-govuk/govuk-prototype-components@v3.0.3...v3.0.4)

---
updated-dependencies:
- dependency-name: "@x-govuk/govuk-prototype-components"
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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