[Open_electroporator] micropython is getting some stm32 updates lately

[John Griessen]

I've done my prelim testing with micropython git from around Apr 11.  There are some changes to
board definition #defines that are what I have used and tested.  So, I don't really want to go back to v1.9.3,
the latest release.

So, we may have some reworking to do to the pulser program,  tim3_enable_tim1_tim2_tim5__tim1_shuts_down.py.

 From git log of latest:

Mon Apr 23 		stm32/uart: Allow ctrl-C to issue keyboard intr when REPL is over UART.
Mon Apr 23 20:44:30	stm32/uart: Allow ctrl-C to work with UARTs put on REPL via os.dupterm.
Tue Apr 24 		stm32: Introduce MICROPY_PY_STM config to include or not the stm module.  reduces the
     firmware by about 7k.
Tue Apr 24		stm32/dac: Support MCUs that don't have TIM4/5 and use new HAL macro.
Tue Apr 24 17:34:07	stm32/i2c: Add low-level I2C driver for F7 MCUs.
Fri Apr 27		stm32/system_stm32: Reconfigure SysTick IRQ priority for L4 MCUs.
Sun Apr 1 		stm32/adc: Add support for H7 MCU series.
stm32/mphalport: Add mp_hal_pin_config_speed() to select GPIO speed.	It should be used after
Tue May 1 		mp_hal_pin_config() or mp_hal_pin_config_alt().
Tue May 1 17:33		stm32/dac: Use mp_hal_pin_config() instead of HAL_GPIO_Init().
Tue May 1 17:38		stm32/boards: Update pins.csv to include USB pins where needed.

It may not be much to do...or we can decide to use a certain commmit fromnear apr 11th instead of latest.