update color-thief to new upstream 0.2.2 release
The build was broken by the deletion of the referenced branch on GitHub after https://github.com/RazrFalcon/color-thief-rs/pull/4 was merged:
Updating git repository `https://github.com/philn/color-thief-rs`
error: failed to get `color-thief` as a dependency of package `gst-plugin-videofx v0.9.0 (/home/be/sw/gst-plugins-rs/video/videofx)`
Caused by:
failed to load source for dependency `color-thief`
Caused by:
Unable to update https://github.com/philn/color-thief-rs?branch=max-colors-respect
Caused by:
failed to find branch `max-colors-respect`
Caused by:
cannot locate remote-tracking branch 'origin/max-colors-respect'; class=Reference (4); code=NotFound (-3)