Bump @mui/material from 5.15.7 to 5.15.9

Bumps [@mui/material](https://github.com/mui/material-ui/tree/HEAD/packages/mui-material) from 5.15.7 to 5.15.9.
- [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/v5.15.9/packages/mui-material)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

package-lock.json

@@ -24,7 +24,7 @@
     "@emotion/react": "^11.11.3",
     "@emotion/styled": "^11.11.0",
     "@mui/icons-material": "^5.15.9",
-    "@mui/material": "^5.15.7",
+    "@mui/material": "^5.15.9",
     "@primer/octicons-react": "^19.8.0",
     "@types/react": "^18.2.55",
     "@types/react-dom": "^18.2.19",