Bump @material-ui/core from 4.12.1 to 4.12.2

Bumps [@material-ui/core](https://github.com/mui-org/material-ui/tree/HEAD/packages/material-ui) from 4.12.1 to 4.12.2.
- [Release notes](https://github.com/mui-org/material-ui/releases)
- [Changelog](https://github.com/mui-org/material-ui/blob/v4.12.2/CHANGELOG.md)
- [Commits](https://github.com/mui-org/material-ui/commits/v4.12.2/packages/material-ui)

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

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

package.json

@@ -6,7 +6,7 @@
   "description": "Template for building an SaaS/admin application using React + Material-UI",
   "dependencies": {
     "@date-io/date-fns": "^1.3.13",
-    "@material-ui/core": "^4.12.1",
+    "@material-ui/core": "^4.12.2",
     "@material-ui/icons": "^4.11.2",
     "@material-ui/pickers": "^3.3.10",
     "@material-ui/system": "^4.12.1",