chore(flutter): update dependency flutter to v3.13.6

[renovate]

This PR contains the following updates:

Package	Update	Change
flutter (source)	patch	3.13.5 -> 3.13.6

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Release Notes

flutter/flutter (flutter)

v3.13.6

Compare Source

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Configuration

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[github-actions]

I'm just a reminder to do the following after updating the Flutter SDK version:

• Run flutter pub get to make sure the dependencies are up-to-date
• Update the Flutter SDk version in HomePage

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (c9e0bda) 96.46% compared to head (d773840) 96.46%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #894   +/-   ##
=======================================
  Coverage   96.46%   96.46%           
=======================================
  Files         113      113           
  Lines        3905     3905           
=======================================
  Hits         3767     3767           
  Misses        138      138           

Flag	Coverage Δ
appainter	96.81% <ø> (ø)
appainter_builder	78.08% <ø> (ø)

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