chore: update flutter version

[DmitrDomrachev]

Checklist

• [x] Have you added an explanation of what your changes do and why you'd like us to include them?
• [ ] Is there an existing issue for this PR?
  • link issue here (use keywords like fix, close, resolve etc. if necessary)
• [x] Have the files been linted and formatted?
• [ ] Have the docs been updated to match the changes in the PR?
• [ ] Have the tests been updated to match the changes in the PR?
• [ ] Attached videos/screenshots demonstrating the fix/feature.
• [x] Have you run the tests locally to confirm they pass?

Changes

update flutter version

[codecov-commenter]

Codecov Report

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

Project coverage is 96.34%. Comparing base (4a646c6) to head (8cc765f). Report is 4 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #89 +/- ## ======================================= Coverage 96.34% 96.34% ======================================= Files 4 4 Lines 82 82 ======================================= Hits 79 79 Misses 3 3 ```

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