Bump @mui/material from 7.3.2 to 7.3.4 in /site

Bumps [@mui/material](https://github.com/mui/material-ui/tree/HEAD/packages/mui-material) from 7.3.2 to 7.3.4.
- [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/v7.3.4/packages/mui-material)

---
updated-dependencies:
- dependency-name: "@mui/material"
  dependency-version: 7.3.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

site/package-lock.json

@@ -11,7 +11,7 @@
     "@emotion/react": "^11.14.0",
     "@emotion/styled": "^11.14.1",
     "@mdx-js/react": "^2.3.0",
-    "@mui/material": "^7.3.2",
+    "@mui/material": "^7.3.4",
     "gatsby": "^5.14.3",
     "gatsby-plugin-image": "^3.15.0",
     "gatsby-plugin-manifest": "^5.15.0",