chore(deps): update dependency less-loader to v5 (#1615)

Author: renovate[bot]

package.json

@@ -121,7 +121,7 @@
         "js-base64": "^2.4.8",
         "jsonp": "^0.2.1",
         "less": "^3.9.0",
-        "less-loader": "^4.1.0",
+        "less-loader": "^5.0.0",
         "less-plugin-npm-import": "^2.1.0",
         "lint-staged": "^7.2.2",
         "markdown-it": "^8.4.0",