Bump @mui/material from 5.16.7 to 5.16.11 in /frontend

Bumps [@mui/material](https://github.com/mui/material-ui/tree/HEAD/packages/mui-material) from 5.16.7 to 5.16.11.
- [Release notes](https://github.com/mui/material-ui/releases)
- [Changelog](https://github.com/mui/material-ui/blob/v5.16.11/CHANGELOG.md)
- [Commits](https://github.com/mui/material-ui/commits/v5.16.11/packages/mui-material)

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

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

frontend/package.json

@@ -31,7 +31,7 @@
         "@emotion/styled": "^11.11.0",
         "@fontsource/roboto": "^5.0.5",
         "@mui/icons-material": "^5.14.0",
-        "@mui/material": "^5.13.7",
+        "@mui/material": "^5.16.11",
         "@mui/x-date-pickers-pro": "^6.9.2",
         "axios": "^1.4.0",
         "core-js": "^3.39.0",