Bump python 39
This MR updates all projects and template files to compile for Python 3.9 and 3.10 only.
Python 3.8 is dead - long live Python 3.10.
Edited by André Anjos
This MR updates all projects and template files to compile for Python 3.9 and 3.10 only.
Python 3.8 is dead - long live Python 3.10.