Fix compat for Python 3.9-3.11

[outloudvi]

fixes #34

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 67.44186% with 14 lines in your changes missing coverage. Please review.

Project coverage is 81.32%. Comparing base (8c4fd21) to head (d81fa86).

Files with missing lines	Patch %	Lines
mw2fcitx/fetch.py	36.36%	7 Missing ⚠️
mw2fcitx/dictgen/pinyin.py	66.66%	3 Missing ⚠️
mw2fcitx/main.py	0.00%	2 Missing ⚠️
mw2fcitx/build_dict.py	66.66%	1 Missing ⚠️
tests/lib/test_utils.py	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #35      +/-   ##
==========================================
- Coverage   81.37%   81.32%   -0.06%     
==========================================
  Files          18       18              
  Lines         494      498       +4     
  Branches       77       83       +6     
==========================================
+ Hits          402      405       +3     
- Misses         71       73       +2     
+ Partials       21       20       -1     

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