Bump sass from 1.28.0 to 1.29.0 (#32111)

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

@@ -130,7 +130,7 @@
     "postcss-cli": "^8.2.0",
     "rollup": "^2.33.1",
     "rollup-plugin-istanbul": "^2.0.1",
-    "sass": "^1.28.0",
+    "sass": "^1.29.0",
     "shelljs": "^0.8.4",
     "stylelint": "^13.7.2",
     "stylelint-config-twbs-bootstrap": "^2.1.0",