chore(deps-dev): update @mui/material requirement from ^6.1.6 to ^6.1.9

Updates the requirements on [@mui/material](https://github.com/mui/material-ui/tree/HEAD/packages/mui-material) to permit the latest version.
- [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:development
...

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

package.json

@@ -28,7 +28,7 @@
     "@iobroker/build-tools": "^2.0.6",
     "@iobroker/adapter-react-v5": "^7.4.2",
     "@iobroker/json-config": "^7.2.6",
-    "@mui/material": "^6.1.6",
+    "@mui/material": "^6.1.9",
     "prop-types": "^15.8.1",
     "react": "^18.3.1",
     "react-dom": "^18.3.1",