Bump @babel/polyfill from 7.7.0 to 7.8.3

Bumps [@babel/polyfill](https://github.com/babel/babel) from 7.7.0 to 7.8.3.
- [Release notes](https://github.com/babel/babel/releases)
- [Changelog](https://github.com/babel/babel/blob/master/CHANGELOG.md)
- [Commits](https://github.com/babel/babel/compare/v7.7.0...v7.8.3)

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

package.json

@@ -26,7 +26,7 @@
 		"test:coverage": "jest --coverage"
 	},
 	"dependencies": {
-		"@babel/polyfill": "^7.7.0",
+		"@babel/polyfill": "^7.8.3",
 		"@babel/runtime": "^7.8.0",
 		"@nextcloud/l10n": "^1.0.1",
 		"@nextcloud/router": "^1.0.0",