message: change luxon version to match others
diff: "@material-ui/lab": "4.0.0-alpha.57",
  "@material-ui/styles": "^4.11.0",
  "highlight.js": "^10.6.0",
  - "luxon": "^2.1.0",
  + "luxon": "^2.0.2",
  "react": "^16.13.1",
  "react-dom": "^16.13.1",
  "react-router": "6.0.0-beta.0",
  