Bump @mui/styles from 5.14.14 to 5.15.16 in /src-admin

Bumps [@mui/styles](https://github.com/mui/material-ui/tree/HEAD/packages/mui-styles) from 5.14.14 to 5.15.16.
- [Release notes](https://github.com/mui/material-ui/releases)
- [Changelog](https://github.com/mui/material-ui/blob/v5.15.16/CHANGELOG.md)
- [Commits](https://github.com/mui/material-ui/commits/v5.15.16/packages/mui-styles)

---
updated-dependencies:
- dependency-name: "@mui/styles"
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

src-admin/package.json

@@ -14,7 +14,7 @@
         "@iobroker/adapter-react-v5": "^4.13.6",
         "@mui/icons-material": "^5.15.15",
         "@mui/material": "5.14.14",
-        "@mui/styles": "5.14.14",
+        "@mui/styles": "5.15.16",
         "@mui/x-date-pickers": "^7.2.0",
         "@originjs/vite-plugin-federation": "^1.3.5",
         "@rollup/plugin-babel": "^6.0.4",