chore(deps): update stylelint to v13.4.0

[renovate[bot]]

This PR contains the following updates:

Package	Update	Type	Change	Sourcegraph
stylelint (source)	minor	devDependencies	13.3.3 -> 13.4.0

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Release Notes

stylelint/stylelint

### [`v13.4.0`](https://togithub.com/stylelint/stylelint/blob/master/CHANGELOG.md#​1340) [Compare Source](https://togithub.com/stylelint/stylelint/compare/13.3.3...13.4.0) - Added: `ignore:["delay"]` to `time-min-milliseconds` ([#​4743](https://togithub.com/stylelint/stylelint/pull/4743)). - Added: `ignoreFunctions: []` to `value-keyword-case` ([#​4733](https://togithub.com/stylelint/stylelint/pull/4733)). - Fixed: improved performance when auto syntax is used ([#​4729](https://togithub.com/stylelint/stylelint/pull/4729)). - Fixed: `--report-needless-disables` respects stylelint-disable commands ([#​4714](https://togithub.com/stylelint/stylelint/pull/4714)). - Fixed: `at-rule-property-requirelist` TypeError for comments inside of font-face ([#​4744](https://togithub.com/stylelint/stylelint/pull/4744)). - Fixed: `declaration-block-trailing-semicolon` false positives for CSS-in-JS object notation ([#​4749](https://togithub.com/stylelint/stylelint/pull/4749)). - Fixed: `declaration-empty-line-before` false positives for inlines styles ([#​4726](https://togithub.com/stylelint/stylelint/pull/4726)). - Fixed: `media-feature-name-*` false positives for `forced-colors` ([#​4775](https://togithub.com/stylelint/stylelint/pull/4775)). - Fixed: `value-keyword-case` false positives WebExtension replacement keywords ([#​4778](https://togithub.com/stylelint/stylelint/pull/4778)). - Fixed: `value-keyword-case` false positives regression for mixed-case properties and the `ignoreProperties` option ([#​4748](https://togithub.com/stylelint/stylelint/pull/4748)).

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