Bump apps/signonotron2 from `f8d9013` to `3c9a770`
Bump apps/signonotron2 from `f8d9013` to `3c9a770`

Bumps [apps/signonotron2](https://github.com/alphagov/signonotron2) from `f8d9013` to `3c9a770`.
- [Release notes](https://github.com/alphagov/signonotron2/releases)
- [Commits](https://github.com/alphagov/signonotron2/compare/f8d90135288a4ba7aa3fe81a4a1f019c9f4eb60f...3c9a770aac69418ca2d9c824c79f8f8ac33b9673)

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