Bump apps/whitehall from `f0a6ead` to `42a8a13`
Bump apps/whitehall from `f0a6ead` to `42a8a13`

Bumps [apps/whitehall](https://github.com/alphagov/whitehall) from `f0a6ead` to `42a8a13`.
- [Release notes](https://github.com/alphagov/whitehall/releases)
- [Commits](https://github.com/alphagov/whitehall/compare/f0a6eadf1a7958062b9fde02f5d5a75b4cb1c9e9...42a8a13805fe5ee7de2ce44dcf095adc80c19747)

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