style: Bump Black's target Python versions for Python 3.9 minimum #4347
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As mentioned in #4291 (comment), the minimum supported Python version of the main branch is 3.9 for a while now, but we still had Black configured to restrict itself to Python 3.8 support.
This PR removes 3.8 from the list of target versions, and adds 3.13, that is going to be released in 12 days (Oct 1, 2024).
This allows Black to use language syntax not available in 3.8, like line breaks in parenthesized
with
context managers.