chore(deps): bump the mui group with 2 updates

Bumps the mui group with 2 updates: [@mui/icons-material](https://github.com/mui/material-ui/tree/HEAD/packages/mui-icons-material) and [@mui/material](https://github.com/mui/material-ui/tree/HEAD/packages/mui-material).


Updates `@mui/icons-material` from 5.15.20 to 5.15.21
- [Release notes](https://github.com/mui/material-ui/releases)
- [Changelog](https://github.com/mui/material-ui/blob/v5.15.21/CHANGELOG.md)
- [Commits](https://github.com/mui/material-ui/commits/v5.15.21/packages/mui-icons-material)

Updates `@mui/material` from 5.15.20 to 5.15.21
- [Release notes](https://github.com/mui/material-ui/releases)
- [Changelog](https://github.com/mui/material-ui/blob/v5.15.21/CHANGELOG.md)
- [Commits](https://github.com/mui/material-ui/commits/v5.15.21/packages/mui-material)

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

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

package.json

@@ -26,8 +26,8 @@
     "@fortawesome/free-solid-svg-icons": "^6.5.2",
     "@fortawesome/react-fontawesome": "^0.2.2",
     "@mdx-js/react": "^3.0.1",
-    "@mui/icons-material": "^5.15.20",
-    "@mui/material": "^5.15.20",
+    "@mui/icons-material": "^5.15.21",
+    "@mui/material": "^5.15.21",
     "@tippyjs/react": "^4.2.6",
     "chroma-js": "^2.4.2",
     "react": "^18.3.1",