Bump apps/whitehall from `a81cf00` to `c9de117`
Bump apps/whitehall from `a81cf00` to `c9de117`

Bumps [apps/whitehall](https://github.com/alphagov/whitehall) from `a81cf00` to `c9de117`.
- [Release notes](https://github.com/alphagov/whitehall/releases)
- [Commits](https://github.com/alphagov/whitehall/compare/a81cf00c9f7c3ef271bca3de48619b9cec89bde0...c9de117b6ac86b4140a0a2b0729e99395b96a076)

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