Bump @mui/material from 5.15.14 to 5.15.15 in /ui (#391)

Bumps [@mui/material](https://github.com/mui/material-ui/tree/HEAD/packages/mui-material) from 5.15.14 to 5.15.15.
- [Release notes](https://github.com/mui/material-ui/releases)
- [Changelog](https://github.com/mui/material-ui/blob/next/CHANGELOG.md)
- [Commits](https://github.com/mui/material-ui/commits/v5.15.15/packages/mui-material)

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

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ui/package.json

@@ -23,7 +23,7 @@
  "@fontsource/montserrat": "^5.0.17",
  "@fontsource/mukta": "^5.0.19",
  "@mui/icons-material": "^5.15.14",
- "@mui/material": "^5.15.14",
+ "@mui/material": "^5.15.15",
  "@mui/material-nextjs": "^5.15.11",
  "@tanstack/react-query": "^5.28.8",
  "clsx": "^2.1.0",