Bump sass from 1.28.0 to 1.29.0 (#15128)

Bumps [sass](https://github.com/sass/dart-sass) from 1.28.0 to 1.29.0.
- [Release notes](https://github.com/sass/dart-sass/releases)
- [Changelog](https://github.com/sass/dart-sass/blob/master/CHANGELOG.md)
- [Commits](https://github.com/sass/dart-sass/compare/1.28.0...1.29.0)

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

package.json

@@ -152,7 +152,7 @@
     "requestidlecallback": "^0.3.0",
     "reselect": "^4.0.0",
     "rimraf": "^3.0.2",
-    "sass": "^1.28.0",
+    "sass": "^1.29.0",
     "sass-loader": "^10.0.5",
     "stacktrace-js": "^2.0.2",
     "stringz": "^2.1.0",