Bump @babel/polyfill from 7.8.3 to 7.8.7

Bumps [@babel/polyfill](https://github.com/babel/babel) from 7.8.3 to 7.8.7.
- [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/v7.8.3...v7.8.7)

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

package.json

@@ -21,7 +21,7 @@
   "dependencies": {
     "@babel/cli": "^7.8.4",
     "@babel/core": "^7.8.6",
-    "@babel/polyfill": "^7.8.3",
+    "@babel/polyfill": "^7.8.7",
     "@babel/preset-env": "^7.8.6",
     "@babel/register": "^7.8.6",
     "@sentry/node": "^5.12.5",