Bump @mui/icons-material from 5.15.17 to 5.15.18 in /website (#141)

Bumps [@mui/icons-material](https://github.com/mui/material-ui/tree/HEAD/packages/mui-icons-material) from 5.15.17 to 5.15.18.
- [Release notes](https://github.com/mui/material-ui/releases)
- [Changelog](https://github.com/mui/material-ui/blob/v5.15.18/CHANGELOG.md)
- [Commits](https://github.com/mui/material-ui/commits/v5.15.18/packages/mui-icons-material)

---
updated-dependencies:
- dependency-name: "@mui/icons-material"
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

website/package.json

@@ -14,7 +14,7 @@
   "dependencies": {
     "@emotion/react": "^11.11.4",
     "@emotion/styled": "^11.11.5",
-    "@mui/icons-material": "^5.15.17",
+    "@mui/icons-material": "^5.15.18",
     "@mui/lab": "^5.0.0-alpha.170",
     "@mui/material": "^5.15.18",
     "@mui/x-data-grid": "^7.4.0",