BREAKING CHANGE: update dependencies

[quicoto]

Description

Updates the Stylelint dependencies

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• I have read the CONTRIBUTING document.
• All new and existing tests passed.

[jimi75]

@quicoto Shouldn't the library version in package.json be changed to 5.x.x since this PR introduces a breaking change?

[easingthemes]

@quicoto Shouldn't the library version in package.json be changed to 5.x.x since this PR introduces a breaking change?

No, version change in package.json is part of the automated release.