Bump govspeak from 5.7.1 to 5.8.0
Bump govspeak from 5.7.1 to 5.8.0

Bumps [govspeak](https://github.com/alphagov/govspeak) from 5.7.1 to 5.8.0.
- [Release notes](https://github.com/alphagov/govspeak/releases)
- [Changelog](https://github.com/alphagov/govspeak/blob/master/CHANGELOG.md)
- [Commits](https://github.com/alphagov/govspeak/compare/v5.7.1...v5.8.0)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
alphagov/service-manual-publisher,alphagov/service-manual-publisher,alphagov/service-manual-publisher