feat: upgrade Flutter version to 3.38

[monkeyWie]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.02%. Comparing base (7b840b4) to head (1c0b2c1).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1256      +/-   ##
==========================================
- Coverage   73.19%   73.02%   -0.18%     
==========================================
  Files          47       47              
  Lines        5842     5842              
==========================================
- Hits         4276     4266      -10     
- Misses       1168     1175       +7     
- Partials      398      401       +3     

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