Bump govuk_publishing_components from 21.16.1 to 21.16.3
Bump govuk_publishing_components from 21.16.1 to 21.16.3

Bumps [govuk_publishing_components](https://github.com/alphagov/govuk_publishing_components) from 21.16.1 to 21.16.3.
- [Release notes](https://github.com/alphagov/govuk_publishing_components/releases)
- [Changelog](https://github.com/alphagov/govuk_publishing_components/blob/master/CHANGELOG.md)
- [Commits](https://github.com/alphagov/govuk_publishing_components/compare/v21.16.1...v21.16.3)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
alphagov/whitehall,alphagov/whitehall,alphagov/whitehall,alphagov/whitehall