chore(deps): bump @mui/material from 5.15.20 to 5.15.21

Bumps [@mui/material](https://github.com/mui/material-ui/tree/HEAD/packages/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/material"
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

package.json

@@ -26,7 +26,7 @@
     "@emotion/react": "^11.11.4",
     "@emotion/styled": "^11.11.5",
     "@mui/icons-material": "^5.15.21",
-    "@mui/material": "^5.15.20",
+    "@mui/material": "^5.15.21",
     "@mui/x-data-grid": "^7.8.0",
     "exceljs": "^4.4.0",
     "ini": "^4.1.3",