Bump @babel/polyfill from 7.11.5 to 7.12.1

Bumps [@babel/polyfill](https://github.com/babel/babel/tree/HEAD/packages/babel-polyfill) from 7.11.5 to 7.12.1.
- [Release notes](https://github.com/babel/babel/releases)
- [Changelog](https://github.com/babel/babel/blob/main/CHANGELOG.md)
- [Commits](https://github.com/babel/babel/commits/v7.12.1/packages/babel-polyfill)

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

package.json

@@ -28,7 +28,7 @@
 		"test:coverage": "jest --coverage"
 	},
 	"dependencies": {
-		"@babel/polyfill": "^7.11.5",
+		"@babel/polyfill": "^7.12.1",
 		"@babel/runtime": "^7.12.1",
 		"@juliushaertl/vue-richtext": "^0.3.3",
 		"@nextcloud/auth": "^1.3.0",