fix(deps): update dependency flex_color_picker to v3

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
flex_color_picker	dependencies	major	^2.2.0 -> ^3.0.0

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[codecov]

Codecov Report

Base: 95.35% // Head: 95.35% // No change to project coverage 👍

Coverage data is based on head (a390763) compared to base (4e47043).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #519   +/-   ##
=======================================
  Coverage   95.35%   95.35%           
=======================================
  Files         110      110           
  Lines        4111     4111           
=======================================
  Hits         3920     3920           
  Misses        191      191           

Flag	Coverage Δ
appainter	95.66% <ø> (ø)
appainter_builder	78.37% <ø> (ø)

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