chore(deps): update dependency css-loader to v6

Author: renovate[bot]

package.json

@@ -137,7 +137,7 @@
     "@types/react-router-dom": "^5.3.3",
     "@types/react-transition-group": "^4.4.0",
     "coveralls": "^3.1.1",
-    "css-loader": "^5.0.1",
+    "css-loader": "^6.0.0",
     "electron": "^13.1.7",
     "electron-builder": "^23.6.0",
     "electron-notarize": "^1.0.1",