chore(deps): bump @material-ui/icons from 5.0.0-beta.1 to 5.0.0-beta.4 (#175)

Bumps [@material-ui/icons](https://github.com/mui-org/material-ui/tree/HEAD/packages/material-ui-icons) from 5.0.0-beta.1 to 5.0.0-beta.4.
- [Release notes](https://github.com/mui-org/material-ui/releases)
- [Changelog](https://github.com/mui-org/material-ui/blob/next/CHANGELOG.md)
- [Commits](https://github.com/mui-org/material-ui/commits/v5.0.0-beta.4/packages/material-ui-icons)

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

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package.json

@@ -16,7 +16,7 @@
     "@fontsource/lexend-deca": "4.4.5",
     "@fontsource/montserrat": "4.4.5",
     "@material-ui/core": "5.0.0-beta.4",
-    "@material-ui/icons": "5.0.0-beta.1",
+    "@material-ui/icons": "5.0.0-beta.4",
     "date-fns-tz": "^1.1.6",
     "react": "17.0.2",
     "react-clock": "3.0.0",