Update @mui/x-date-pickers requirement in /src-admin

Updates the requirements on [@mui/x-date-pickers](https://github.com/mui/mui-x/tree/HEAD/packages/x-date-pickers) to permit the latest version.
- [Release notes](https://github.com/mui/mui-x/releases)
- [Changelog](https://github.com/mui/mui-x/blob/v7.28.2/CHANGELOG.md)
- [Commits](https://github.com/mui/mui-x/commits/v7.28.2/packages/x-date-pickers)

---
updated-dependencies:
- dependency-name: "@mui/x-date-pickers"
  dependency-version: 7.28.2
  dependency-type: direct:development
...

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

Author: dependabot[bot]

src-admin/package.json

@@ -14,7 +14,7 @@
         "@iobroker/json-config": "^7.4.4",
         "@mui/icons-material": "^5.16.11",
         "@mui/material": "^5.16.11",
-        "@mui/x-date-pickers": "^7.23.1",
+        "@mui/x-date-pickers": "^7.28.2",
         "@originjs/vite-plugin-federation": "^1.3.6",
         "@rollup/plugin-babel": "^6.0.4",
         "@rollup/plugin-commonjs": "^28.0.1",