Bump @babel/polyfill from 7.4.4 to 7.8.3

Bumps [@babel/polyfill](https://github.com/babel/babel) from 7.4.4 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/v7.4.4...v7.8.3)

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

package.json

@@ -21,7 +21,7 @@
   "dependencies": {
     "@babel/cli": "^7.0.0",
     "@babel/core": "^7.0.0",
-    "@babel/polyfill": "^7.0.0",
+    "@babel/polyfill": "^7.8.3",
     "@babel/preset-env": "^7.8.3",
     "@babel/register": "^7.0.0",
     "@sentry/node": "^5.4.0",