message: Return material-ui/lab
diff: "@backstage/theme": "^0.2.3",
  "@material-ui/core": "^4.11.0",
  "@material-ui/icons": "^4.9.1",
  + "@material-ui/lab": "4.0.0-alpha.45",
  "@rjsf/core": "^2.4.0",
  "@rjsf/material-ui": "^2.4.0",
  "classnames": "^2.2.6",
  