Remove pymongo<4.9 pin, upgrade pymongo, and fixed errors and warnings

[dill0wn]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.43%. Comparing base (637a033) to head (070df5a).
Report is 24 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #69      +/-   ##
==========================================
+ Coverage   90.19%   91.43%   +1.23%     
==========================================
  Files          43       47       +4     
  Lines        6724     7160     +436     
==========================================
+ Hits         6065     6547     +482     
+ Misses        659      613      -46     

Flag	Coverage Δ
tests-3.10	91.61% <100.00%> (+1.23%)	⬆️
tests-3.11	91.61% <100.00%> (+1.23%)	⬆️
tests-3.12	91.61% <100.00%> (?)
tests-3.7	?
tests-3.8	?
tests-3.9	91.43% <100.00%> (+1.23%)	⬆️
tests-pypy3.9	91.56% <100.00%> (+1.23%)	⬆️

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