chore(deps): bump @material-ui/core from 5.0.0-beta.3 to 5.0.0-beta.4 (#174)

Bumps [@material-ui/core](https://github.com/mui-org/material-ui/tree/HEAD/packages/material-ui) from 5.0.0-beta.3 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)

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

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

package.json

@@ -15,7 +15,7 @@
     "@emotion/styled": "^11.3.0",
     "@fontsource/lexend-deca": "4.4.5",
     "@fontsource/montserrat": "4.4.5",
-    "@material-ui/core": "5.0.0-beta.3",
+    "@material-ui/core": "5.0.0-beta.4",
     "@material-ui/icons": "5.0.0-beta.1",
     "date-fns-tz": "^1.1.6",
     "react": "17.0.2",