chore: Update flutter version.

[iphydf]

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Codecov Report

❌ Patch coverage is 73.80952% with 11 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.20%. Comparing base (51087ea) to head (5abe84e).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
lib/providers/sodium_native_loader.dart	63.63%	4 Missing ⚠️
lib/pages/settings_page.dart	50.00%	2 Missing ⚠️
lib/widgets/nickname_field.dart	0.00%	2 Missing ⚠️
lib/widgets/status_message_field.dart	0.00%	2 Missing ⚠️
lib/providers/sodium.dart	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #95      +/-   ##
==========================================
+ Coverage   83.13%   83.20%   +0.07%     
==========================================
  Files          62       63       +1     
  Lines        2520     2543      +23     
==========================================
+ Hits         2095     2116      +21     
- Misses        425      427       +2     

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