Bump @mui/material from 5.15.13 to 5.15.15 in /client (#194)

Bumps [@mui/material](https://github.com/mui/material-ui/tree/HEAD/packages/mui-material) from 5.15.13 to 5.15.15.
- [Release notes](https://github.com/mui/material-ui/releases)
- [Changelog](https://github.com/mui/material-ui/blob/v5.15.15/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
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

client/package.json

@@ -7,7 +7,7 @@
     "@fortawesome/free-solid-svg-icons": "^6.5.1",
     "@fortawesome/react-fontawesome": "^0.2.0",
     "@mui/icons-material": "^5.15.14",
-    "@mui/material": "^5.15.13",
+    "@mui/material": "^5.15.15",
     "axios": "^1.6.7",
     "bootstrap": "^5.3.3",
     "react": "^18.2.0",