Update to Stylelint 15+

[davidsneighbour]

In the latest stylelint version a handfull of rules are deprecated and now throw warnings in current versions when running stylelint extending stylelint-config-sass-guidelines:

Deprecation warnings:
 - The "block-opening-brace-space-before" rule is deprecated.
 - The "color-hex-case" rule is deprecated.
 - The "declaration-bang-space-after" rule is deprecated.
 - The "declaration-bang-space-before" rule is deprecated.
...

Migration notes can be found here.

[FloEdelmann]

Allowing installing stylelint-config-sass-guidelines together with Stylelint v15 would be a good first step that could be released as a minor or patch version. See #273.

[bjankord]

v10.0.0 is available now and supports stylelint v15: https://www.npmjs.com/package/stylelint-config-sass-guidelines/v/10.0.0
You can view the changelog here: https://github.com/bjankord/stylelint-config-sass-guidelines/blob/main/CHANGELOG.md#1000