Bump @mui/material from 6.4.2 to 6.4.3 in /src/frontend

Bumps [@mui/material](https://github.com/mui/material-ui/tree/HEAD/packages/mui-material) from 6.4.2 to 6.4.3.
- [Release notes](https://github.com/mui/material-ui/releases)
- [Changelog](https://github.com/mui/material-ui/blob/v6.4.3/CHANGELOG.md)
- [Commits](https://github.com/mui/material-ui/commits/v6.4.3/packages/mui-material)

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

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