build(deps): update rust crate colorgrad to 0.7.0

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This PR contains the following updates:

Package	Type	Update	Change
colorgrad	dependencies	minor	0.6.2 -> 0.7.0

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Release Notes

mazznoer/colorgrad-rs (colorgrad)

v0.7.0

Compare Source

Added

• BlendMode::Lab, optional feature, can be enabled using features = ["lab"] in Cargo.toml
• GradientBuilder new method css() for parsing css gradient format

Changed

• f64 -> f32.
• GimpGradient is now a optional feature, can be enabled using features = ["ggr"] in Cargo.toml
• Preset gradients move to submodule preset.
• In previous version Gradient is a struct holding LinearGradient, BasisGradient, etc in a Box.
  Now Gradient is a trait. LinearGradient, BasisGradient, etc is now exposed directy,
  and they are implementing Gradient trait.
• CustomGradient renamed to GradientBuilder
• CustomGradientError renamed to GradientBuilderError

Removed

• BlendMode::Hsv

Fixed

• Error parsing GIMP gradient with UTF-8 BOM.

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