Update lighthouse requirement from ^6.4.0 to ^6.4.1

Updates the requirements on [lighthouse](https://github.com/GoogleChrome/lighthouse) to permit the latest version.
- [Release notes](https://github.com/GoogleChrome/lighthouse/releases)
- [Changelog](https://github.com/GoogleChrome/lighthouse/blob/master/changelog.md)
- [Commits](GoogleChrome/lighthouse@v6.4.0...v6.4.1)

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

package.json

@@ -20,7 +20,7 @@
     "@babel/preset-env": "^7.11.5",
     "babel-loader": "^8.1.0",
     "css-loader": "^4.3.0",
-    "lighthouse": "^6.4.0",
+    "lighthouse": "^6.4.1",
     "mini-css-extract-plugin": "^0.11.2",
     "prettier": "^2.1.2",
     "sass": "^1.26.11",