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Recent change introduced typing that is incompatible with Python < 3.9. There are other Scylla projects relying on CCM (e.g. most drivers) and for some of them this change caused CI failures (as of now - for Rust driver and Python driver).
This PR fixes the problem by making this typing compatible with older Python versions.
It also adds CI that runs on older Python. I wanted it to be 3.6, because that's the oldest version supported by Python driver, but it seems this version can't be installed by
setup-python@v4
action, so I bumped it to 3.8