chore: Deprecated Python 3.9 support

[Pringled]

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Files with missing lines	Coverage Δ
vicinity/backends/__init__.py	88.09% <100.00%> (-11.91%)	⬇️
vicinity/backends/annoy.py	95.23% <100.00%> (+0.30%)	⬆️
vicinity/backends/base.py	85.50% <100.00%> (+2.45%)	⬆️
vicinity/backends/basic.py	84.78% <100.00%> (-5.54%)	⬇️
vicinity/backends/faiss.py	90.00% <100.00%> (ø)
vicinity/backends/hnsw.py	95.52% <100.00%> (-2.76%)	⬇️
vicinity/backends/pynndescent.py	95.52% <100.00%> (-1.26%)	⬇️
vicinity/backends/usearch.py	97.22% <100.00%> (ø)
vicinity/backends/voyager.py	96.92% <100.00%> (ø)
vicinity/datatypes.py	100.00% <100.00%> (ø)
... and 2 more

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