validate-property-value: false-positive on `background-color` value format

[softdays]

Hi, please have a look a the false-positive below:

@see https://drafts.csswg.org/css-color/#typedef-hex-color

8 digits
The first 6 digits are interpreted identically to the 6-digit notation. The last pair of digits, interpreted as a hexadecimal number, specifies the alpha channel of the color, where 00 represents a fully transparent color and ff represent a fully opaque color.
In other words, #0000ffcc represents the same color as rgb(0 0 100% / 80%) (a slightly-transparent blue).

[racodond]

Hi @softdays,

I don't want to keep maintaining this plugin. Feel free to ping me if you want to take over.

Regards,

David