machine.reset_cause() reports 0 instead of 4 when system starts from stop or standby mode.

MicroPython v1.20.0-288-g3a153d92f-dirty on 2023-10-15; NUCLEO_H563ZI with STM32H563ZI
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The fix is to to add the following in void machine_init(void)

#elif defined(STM32H5)
if (PWR->PMSR & PWR_PMSR_STOPF || PWR->PMSR & PWR_PMSR_SBF) {
    // came out of standby or stop mode
    reset_cause = PYB_RESET_DEEPSLEEP;
    PWR->PMCR |= PWR_PMCR_CSSF;
} else

A PR will follow in the next days.