Bump apps/frontend from `4aa5885` to `91eb3d2`
Bump apps/frontend from `4aa5885` to `91eb3d2`

Bumps [apps/frontend](https://github.com/alphagov/frontend) from `4aa5885` to `91eb3d2`.
- [Release notes](https://github.com/alphagov/frontend/releases)
- [Commits](https://github.com/alphagov/frontend/compare/4aa5885b252ede30bc23aef3dc1c3eebcf817a5a...91eb3d2c638a9e255017f3147776a84fb89acf7b)

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