Update mypy to 1.14.0

[shunichironomura]

• update mypy to 1.14.0
• resolve mypy errors

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 61.52%. Comparing base (62961be) to head (ff9236b).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
capsula/_cli.py	0.00%	1 Missing ⚠️
capsula/_decorator.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #415   +/-   ##
=======================================
  Coverage   61.52%   61.52%           
=======================================
  Files          30       30           
  Lines        1180     1180           
=======================================
  Hits          726      726           
  Misses        454      454           

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