Merge pull request #318 from textpattern/dependabot/npm_and_yarn/sass-1.29.0

Bump sass from 1.28.0 to 1.29.0

Author: philwareham

package.json

@@ -26,7 +26,7 @@
     "grunt-sass": "3.1.0",
     "grunt-stylelint": "0.15.0",
     "load-grunt-tasks": "5.1.0",
-    "sass": "1.28.0",
+    "sass": "1.29.0",
     "stylelint": "13.7.2",
     "stylelint-order": "4.1.0",
     "stylelint-scss": "3.18.0"