Update Stylelint and Postcss

R=jacktfranklin@chromium.org

Bug: none
Change-Id: I961be18530d3ccbc4efed0c2cda9bd603b14e27b
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/3372931
Reviewed-by: Jack Franklin <jacktfranklin@chromium.org>
Commit-Queue: Tim Van der Lippe <tvanderlippe@chromium.org>
diff --git a/node_modules/stylelint/lib/createStylelint.js b/node_modules/stylelint/lib/createStylelint.js
index 4a0b486..ffe0a04 100644
--- a/node_modules/stylelint/lib/createStylelint.js
+++ b/node_modules/stylelint/lib/createStylelint.js
@@ -22,12 +22,14 @@
  * @returns {StylelintInternalApi}
  */
 function createStylelint(options = {}) {
+	const cwd = options.cwd || process.cwd();
+
 	/** @type {StylelintInternalApi} */
 	// @ts-expect-error -- TS2740: Type '{ _options: LinterOptions; }' is missing the following properties from type 'InternalApi'
-	const stylelint = { _options: options };
+	const stylelint = { _options: { ...options, cwd } };
 
 	stylelint._extendExplorer = cosmiconfig('', {
-		transform: augmentConfig.augmentConfigExtended.bind(null, stylelint),
+		transform: augmentConfig.augmentConfigExtended(cwd),
 		stopDir: STOP_DIR,
 	});