Update dependency dynamic_color to v2

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
dynamic_color (source)	dependencies	major	^1.8.1 → ^2.0.0

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Release Notes

material-foundation/flutter-packages (dynamic_color)

v2.1.0

Added

• Add support for the XDG Desktop Portal Settings for accent-color on Linux

v2.0.2

Fixed

• Apply Kotlin Android plugin conditionally for AGP version before 9 compatibility (#​695)

v2.0.1

Changed

• Fix link to ColorScheme.fromImageProvider in README

v2.0.0

Changed

• Migrate to material_ui package version 1.0.0 and set minimum material_color_utilities to 0.13.0

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