stylelint 16.21.1

It fixes 3 bugs.

Fixed: unexpected change of syntax in computed EditInfo (#8638) (@romainmenke).
Fixed: function-linear-gradient-no-nonstandard-direction false positives for CSS variables' names containing a direction substring (#8643) (@Solomon-mithra).
Fixed: media-feature-range-notation autofix for exact values (#8651) (@romainmenke).