Support for pi5

[steffenix]

The Pi5 has new GPIO hardware. It is not compatible with software written for earlier Pi models.

The pimoroni team has started to port the python library to use gpiod and add compatibility with the pi5 using gpiod.
https://github.com/pimoroni/inky/pull/182/files#diff-52575fc33840b6f6f6c6cc6cd9891dcd4c42257f849eb3b8be9fda3b693f537f