upgrade: update dependency flutter to v3.19.5

[renovate]

This PR contains the following updates:

Package	Update	Change
flutter (source)	patch	3.19.4 -> 3.19.5

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Release Notes

flutter/flutter (flutter)

v3.19.5

Compare Source

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Configuration

📅 Schedule: Branch creation - "every weekend" in timezone Asia/Tokyo, Automerge - At any time (no schedule defined).

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.22%. Comparing base (bc29a0e) to head (20e824f).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #499   +/-   ##
=======================================
  Coverage   97.22%   97.22%           
=======================================
  Files          22       22           
  Lines         756      756           
=======================================
  Hits          735      735           
  Misses         21       21           

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