Bump @material-ui/core from 4.11.4 to 4.12.3 (#3554)

Bumps [@material-ui/core](https://github.com/mui-org/material-ui/tree/HEAD/packages/material-ui) from 4.11.4 to 4.12.3.
- [Release notes](https://github.com/mui-org/material-ui/releases)
- [Changelog](https://github.com/mui-org/material-ui/blob/v4.12.3/CHANGELOG.md)
- [Commits](https://github.com/mui-org/material-ui/commits/v4.12.3/packages/material-ui)

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

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

package.json

@@ -250,7 +250,7 @@
   },
   "devDependencies": {
     "@emeraldpay/hashicon-react": "^0.4.0",
-    "@material-ui/core": "^4.11.4",
+    "@material-ui/core": "^4.12.3",
     "@material-ui/icons": "^4.11.2",
     "@material-ui/lab": "^4.0.0-alpha.57",
     "@pmmmwh/react-refresh-webpack-plugin": "^0.4.3",