Bump gds-sso from 15.0.1 to 15.1.0
Bump gds-sso from 15.0.1 to 15.1.0

Bumps [gds-sso](https://github.com/alphagov/gds-sso) from 15.0.1 to 15.1.0.
- [Release notes](https://github.com/alphagov/gds-sso/releases)
- [Changelog](https://github.com/alphagov/gds-sso/blob/master/CHANGELOG.md)
- [Commits](https://github.com/alphagov/gds-sso/compare/v15.0.1...v15.1.0)

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