Jose Cano

Added macro NRF52_SERIES when checking for _delay_us to work with NRF52840

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Compilation error on NRF52840

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Store/Update Bill API end_date and extension_date cant be null in request

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### Support guidelines - [X] I've read the [support guidelines](https://github.com/firefly-iii/firefly-iii/blob/main/.github/support.md) ### I've found a bug and checked that ... - [X] ... [the documentation](https://docs.firefly-iii.org/) does not mention anything about my...