Bump sass from 1.26.2 to 1.26.3

Bumps [sass](https://github.com/sass/dart-sass) from 1.26.2 to 1.26.3.
- [Release notes](https://github.com/sass/dart-sass/releases)
- [Changelog](https://github.com/sass/dart-sass/blob/master/CHANGELOG.md)
- [Commits](sass/dart-sass@1.26.2...1.26.3)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Author: dependabot-preview[bot]

package-lock.json

@@ -88,7 +88,7 @@
     "prettier": "^1.19.1",
     "qunit-console-grouper": "^0.2.0",
     "qunit-dom": "^1.1.0",
-    "sass": "^1.26.2",
+    "sass": "^1.26.3",
     "semver": "^7.1.3",
     "timekeeper": "^2.2.0"
   },