Bump @mui/material-nextjs from 6.4.2 to 6.4.3

Bumps [@mui/material-nextjs](https://github.com/mui/material-ui/tree/HEAD/packages/mui-material-nextjs) 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-nextjs)

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

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

package.json

@@ -20,7 +20,7 @@
     "@mui/icons-material": "^6.4.4",
     "@mui/joy": "^5.0.0-beta.51",
     "@mui/material": "^6.4.4",
-    "@mui/material-nextjs": "^6.4.2",
+    "@mui/material-nextjs": "^6.4.3",
     "@next/third-parties": "15.1.7",
     "escape-html": "^1.0.3",
     "gray-matter": "^4.0.3",