chore(deps): bump @mui/material from 5.15.4 to 5.15.6 (#22)

Bumps [@mui/material](https://github.com/mui/material-ui/tree/HEAD/packages/mui-material) from 5.15.4 to 5.15.6.
- [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/v5.15.6/packages/mui-material)

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

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

package.json

@@ -30,7 +30,7 @@
     "@emotion/styled": "^11.11.0",
     "@fontsource/roboto": "^5.0.8",
     "@mui/icons-material": "^5.15.6",
-    "@mui/material": "^5.15.4",
+    "@mui/material": "^5.15.6",
     "@react-three/drei": "^9.93.0",
     "@react-three/fiber": "^8.15.15",
     "@types/three": "^0.160.0",