Update pyserial dependency to 3.5.0 to allow MacOS Big Sur compatibility

Summary:

Currently (as in: currently downloadable version), Inkscape ships with pyserial 3.4. However due to Apples Mac OS Update to Version 11.0 pyserial 3.4 is partially not working on Mac OS Big Sur (see issue here: https://github.com/pyserial/pyserial/pull/518). This means, that e.g. Export/Plot plugin is not working on Big Sur. Pyserial already fixed this by releasing v3.5 (https://pypi.org/project/pyserial/#history). I'd appreciate if this dependency could be updated.

Edited Mar 03, 2021 by Moritz Stückler

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