upgrade: update dependency flutter to v3.19.0

[renovate[bot]]

This PR contains the following updates:

Package	Update	Change	Pending
flutter (source)	minor	3.16.0 -> 3.19.0	3.19.1

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Release Notes

flutter/flutter (flutter)

v3.19.0

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v3.16.9

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v3.16.8

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v3.16.7

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v3.16.6

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v3.16.5

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v3.16.4

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v3.16.3

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v3.16.2

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v3.16.1

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Configuration

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

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

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• [ ] If you want to rebase/retry this PR, check this box

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 98.35%. Comparing base (fc5aa11) to head (4c6b740).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #467   +/-   ##
=======================================
  Coverage   98.35%   98.35%           
=======================================
  Files          21       21           
  Lines         730      730           
=======================================
  Hits          718      718           
  Misses         12       12           

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