Bump @mui/icons-material from 5.15.2 to 5.15.7 in /frontend

Bumps [@mui/icons-material](https://github.com/mui/material-ui/tree/HEAD/packages/mui-icons-material) from 5.15.2 to 5.15.7.
- [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/v5.15.7/packages/mui-icons-material)

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

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

Author: dependabot[bot]

frontend/package-lock.json

@@ -26,7 +26,7 @@
     "@emotion/react": "^11.11.1",
     "@emotion/styled": "^11.11.0",
     "@fontsource/roboto": "^5.0.8",
-    "@mui/icons-material": "^5.14.19",
+    "@mui/icons-material": "^5.15.7",
     "@mui/material": "^5.14.19",
     "@mui/x-data-grid": "^6.18.2",
     "@sentry/react": "^7.93.0",