Bump apps/signonotron2 from `d6ad5a9` to `e4cffe6`
Bump apps/signonotron2 from `d6ad5a9` to `e4cffe6`

Bumps [apps/signonotron2](https://github.com/alphagov/signonotron2) from `d6ad5a9` to `e4cffe6`.
- [Release notes](https://github.com/alphagov/signonotron2/releases)
- [Commits](https://github.com/alphagov/signonotron2/compare/d6ad5a98371996fc40486943cb9ee9e041ef757a...e4cffe6e7d477960348f439e5b5c38dfebadbc03)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
eliotsykes/real-world-rails