Bump apps/whitehall from `d74b726` to `956198e`
Bump apps/whitehall from `d74b726` to `956198e`

Bumps [apps/whitehall](https://github.com/alphagov/whitehall) from `d74b726` to `956198e`.
- [Release notes](https://github.com/alphagov/whitehall/releases)
- [Commits](https://github.com/alphagov/whitehall/compare/d74b726fa82c14a2bd129fac1d6a4d3f672d0207...956198ea4d40d4bee54418f45ba7e590cb93e59d)

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