Update Colorjs to latest when it releases support for more unit types in `hsl`

Colorjs recently [added support for other unit types in the `hsl` color function](https://github.com/LeaVerou/color.js/issues/311). This might allow us to [re-activate a skipped test](https://github.com/dequelabs/axe-core/blob/develop/test/commons/color/color.js#L61-L68), but will definitely allow us to add more unit tests to ensure support for the units in the `hsl` function. Colorjs hasn't released the feature yet to npm, so just adding this issue here so we don't forget to get the newest version when it releases and re-activate the test.