Update node-sass from 4.12.0 to 4.14.1

to support Node.js 14, the upcoming Node LTS
Signed-off-by: Takuya Noguchi <takninnovationresearch@gmail.com>

changelogs/unreleased/258964-update-node-sass-from-4-12-to-4-14.yml

+---
+title: Update node-sass from 4.12.0 to 4.14.1
+merge_request: 43808
+author: Takuya Noguchi
+type: other

package.json

@@ -205,7 +205,7 @@
     "karma-webpack": "^4.0.2",
     "markdownlint-cli": "0.23.2",
     "md5": "^2.2.1",
-    "node-sass": "^4.12.0",
+    "node-sass": "^4.14.1",
     "nodemon": "^2.0.4",
     "pixelmatch": "^4.0.2",
     "postcss": "^7.0.14",