drop python 3.9 support

[barrust]

No description provided.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.32%. Comparing base (5119dea) to head (2a1b6ba).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #143      +/-   ##
==========================================
- Coverage   99.32%   99.32%   -0.01%     
==========================================
  Files          16       16              
  Lines        1921     1917       -4     
==========================================
- Hits         1908     1904       -4     
  Misses         13       13              

Files with missing lines	Coverage Δ
probables/blooms/bloom.py	100.00% <100.00%> (ø)
probables/blooms/countingbloom.py	100.00% <100.00%> (ø)
probables/blooms/expandingbloom.py	100.00% <100.00%> (ø)
probables/countminsketch/countminsketch.py	100.00% <100.00%> (ø)
probables/cuckoo/countingcuckoo.py	98.42% <100.00%> (ø)
probables/cuckoo/cuckoo.py	98.79% <100.00%> (-0.01%)	⬇️
probables/hashes.py	100.00% <100.00%> (ø)
probables/quotientfilter/quotientfilter.py	97.74% <100.00%> (ø)
probables/utilities.py	100.00% <100.00%> (ø)

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