Bump @octokit/rest from 18.0.9 to 19.0.4 in /website

Bumps [@octokit/rest](https://github.com/octokit/rest.js) from 18.0.9 to 19.0.4.
- [Release notes](https://github.com/octokit/rest.js/releases)
- [Commits](octokit/rest.js@v18.0.9...v19.0.4)

---
updated-dependencies:
- dependency-name: "@octokit/rest"
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

website/package.json

@@ -30,7 +30,7 @@
     "@material-ui/core": "^4.11.2",
     "@material-ui/icons": "^4.11.2",
     "@material-ui/lab": "^4.0.0-alpha.56",
-    "@octokit/rest": "^18.0.9",
+    "@octokit/rest": "^19.0.4",
     "lodash.mapvalues": "^4.6.0",
     "react": "^17.0.1",
     "react-dom": "^17.0.1",