Bump @mui/material from 5.16.7 to 6.1.9

Bumps [@mui/material](https://github.com/mui/material-ui/tree/HEAD/packages/mui-material) from 5.16.7 to 6.1.9.
- [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/v6.1.9/packages/mui-material)

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

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

package.json

@@ -7,7 +7,7 @@
     "@emotion/styled": "^11.13.0",
     "@fontsource-variable/roboto-flex": "^5.1.0",
     "@iarna/toml": "^2.2.5",
-    "@mui/material": "^5.16.7",
+    "@mui/material": "^6.1.10",
     "@opencast/appkit": "^0.3.1",
     "@reduxjs/toolkit": "^2.4.0",
     "@types/react": "^18.3.12",