Update Thonny to 3.2.1

Changes:

• 3.2.1:
  • Bugfixes and translation updates
• 3.2.0:
  • New addons and capabilities for the Shell
  • Extended Files view
  • Improvements for working with MicroPython/CircuitPython boards
  • Other minor changes and improvements

Full changelog available here

Fixes T8278

Packaging update: Changed to github source

Executed a simple hello world and random number script, checking the new "Plotter" view with the latter, changed my theme and font settings