chore(deps): update dependency less to v3.13.1

Author: renovate-bot

npm-shrinkwrap.json

@@ -92,7 +92,7 @@
 		"html-webpack-plugin": "3.2.0",
 		"jasmine": "3.4.0",
 		"jasmine-console-reporter": "3.1.0",
-		"less": "3.9.0",
+		"less": "3.13.1",
 		"less-loader": "5.0.0",
 		"lighthousebot": "git+https://github.com/GoogleChromeLabs/lighthousebot.git",
 		"lodash-webpack-plugin": "0.11.5",