国勢調査結果の秘匿地域の併合処理を修正

[ciscorn]

Closes #26

[codecov]

Codecov Report

Attention: 48 lines in your changes are missing coverage. Please review.

Comparison is base (a1c64de) 27.91% compared to head (370c288) 27.23%.

Files	Patch %	Lines
japanese_grids/algorithms/load_estat_csv.py	4.00%	48 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #27      +/-   ##
==========================================
- Coverage   27.91%   27.23%   -0.68%     
==========================================
  Files           9        9              
  Lines         627      650      +23     
==========================================
+ Hits          175      177       +2     
- Misses        452      473      +21     

Flag	Coverage Δ
unittests	27.23% <4.00%> (-0.68%)	⬇️

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