chore(deps): bump discounts from d9ffe91 to 3caf561 (#401)

Bumps [discounts](https://github.com/AEGEE/discounts) from `d9ffe91` to `3caf561`.
- [Release notes](https://github.com/AEGEE/discounts/releases)
- [Commits](AEGEE/discounts@d9ffe91...3caf561)

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