Bump govuk-eleventy-plugin from 2.0.1 to 2.2.0

Bumps [govuk-eleventy-plugin](https://github.com/x-govuk/govuk-eleventy-plugin) from 2.0.1 to 2.2.0.
- [Release notes](https://github.com/x-govuk/govuk-eleventy-plugin/releases)
- [Commits](x-govuk/govuk-eleventy-plugin@v2.0.1...v2.2.0)

---
updated-dependencies:
- dependency-name: govuk-eleventy-plugin
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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