WeAct STM32H503CBU6 Arduino support

[justinjools]

Is the WeAct STM32H503CBU6 at 250mhz supported by Arduino. I expect it must be but can't see it in the H5 list unless it's Generic STM32H503KBUx?

I don't expect I'd notice much difference over STM32F411 at 100mhz but thought I'd try this newer one.

[STM32ardui]

https://github.com/stm32duino/Arduino_C ... 2h5-boards