build(deps): Bump @mui/material from 6.1.8 to 6.1.9

Bumps [@mui/material](https://github.com/mui/material-ui/tree/HEAD/packages/mui-material) from 6.1.8 to 6.1.9.
- [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/v6.1.9/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]>

package.json

@@ -19,7 +19,7 @@
     "@iostindex/gatsby-plugin-material-ui": "^5.0.0",
     "@mdx-js/mdx": "^3.1.0",
     "@mui/icons-material": "^6.1.8",
-    "@mui/material": "^6.1.8",
+    "@mui/material": "^6.1.9",
     "@types/react": "^18.3.12",
     "axios": "^1.7.8",
     "decode-uri-component": "^0.4.1",