Bump apps/zammad from `2df6731` to `ac64f4a`
Bump apps/zammad from `2df6731` to `ac64f4a`

Bumps [apps/zammad](https://github.com/zammad/zammad) from `2df6731` to `ac64f4a`.
- [Release notes](https://github.com/zammad/zammad/releases)
- [Commits](https://github.com/zammad/zammad/compare/2df673162755231a1878ca2917ac26e67e1567ab...ac64f4a156d624816622b3b0a5a50b565a4f1ed0)

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