Upgrade to MicroPython 19.1

[mjaskula]

Upgrade to MicroPython 19.1

MicroPython 19.1 has been released. We should make sure that the EuroPi software is compatible. And then update our documentation.

Test the following under 19.1:

• micropython install procedure
• All hardware (diagnostic script may be a good way)
• all contrib scripts
• anything referenced in the 19.1 change log that looks relevant

Update the following:

• MicroPython Install process to reference 19.1
• write documentation on upgrading 18 -> 19.1