Increase minimum Python version for to 3.10 (for develop-1.9 branch) #1509
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Reason for this pull request
Python 3.10 is cool. Especially the | operator for type hints.
Proposed changes
Increase minimum Python version to 3.10
Drop 3.9 smoke tests, add 3.12 smoke tests
Tests added / passed
Fully documented, including
docs/about/whats_new.rst
for all changes