RFC: Let's document (and enforce?) a minimum Python version for LLDB

Thanks @emaste.

I also heard back from Brad Styles who said that:

OpenBSD uses Python 3.11 as the default. NetBSD uses Python 3.12 as the
default.

Once we have confirmation about llvm’s Debian 10 builds, I will go ahead with 3.8 as the minimum. Warning for 20, requirement for 21.

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