doc,setup.py,NEWS: Prepare for next releases - 1.93.3

Chandan Singhrequested to merge
chandan/1.93.3 into master

1.93.2 never got released on PyPI due to failing pipeline (see https://gitlab.com/BuildStream/bst-plugins-experimental/pipelines/140949807). So, anyone using this from PyPI is going to get a lot of breaking changes at once.

Edited by Chandan Singh

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