fix: package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-TRIMNEWLINES-1298042

Author: snyk-bot

package.json

@@ -37,7 +37,7 @@
 		"mj-pa": "^1.3.1",
 		"moment": "^2.23.0",
 		"moment-strftime": "^0.5.0",
-		"node-sass": "^4.14.1",
+		"node-sass": "^6.0.1",
 		"node-sass-utils": "^1.1.2",
 		"postcss": "^8.2.8",
 		"react": "^16.14.0",