[npm] Bump @mui/styled-engine-sc from 5.14.8 to 5.14.9 in /frontend

Bumps [@mui/styled-engine-sc](https://github.com/mui/material-ui/tree/HEAD/packages/mui-styled-engine-sc) from 5.14.8 to 5.14.9.
- [Release notes](https://github.com/mui/material-ui/releases)
- [Changelog](https://github.com/mui/material-ui/blob/master/CHANGELOG.md)
- [Commits](https://github.com/mui/material-ui/commits/v5.14.9/packages/mui-styled-engine-sc)

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

Signed-off-by: dependabot[bot] <[email protected]>