chore(deps): bump core-js from 2.6.5 to 2.6.9

Bumps [core-js](https://github.com/zloirock/core-js) from 2.6.5 to 2.6.9.
- [Release notes](https://github.com/zloirock/core-js/releases)
- [Changelog](https://github.com/zloirock/core-js/blob/master/CHANGELOG.md)
- [Commits](zloirock/core-js@v2.6.5...v2.6.9)

yarn.lock

@@ -1756,9 +1756,9 @@ core-js-pure@3.1.2:
   integrity sha512-5ckIdBF26B3ldK9PM177y2ZcATP2oweam9RskHSoqfZCrJ2As6wVg8zJ1zTriFsZf6clj/N1ThDFRGaomMsh9w==
 
 core-js@^2.4.0, core-js@^2.5.0:
-  version "2.6.5"
-  resolved "https://registry.yarnpkg.com/core-js/-/core-js-2.6.5.tgz#44bc8d249e7fb2ff5d00e0341a7ffb94fbf67895"
-  integrity sha512-klh/kDpwX8hryYL14M9w/xei6vrv6sE8gTHDG7/T/+SEovB/G4ejwcfE/CBzO6Edsu+OETZMZ3wcX/EjUkrl5A==
+  version "2.6.9"
+  resolved "https://registry.yarnpkg.com/core-js/-/core-js-2.6.9.tgz#6b4b214620c834152e179323727fc19741b084f2"
+  integrity sha512-HOpZf6eXmnl7la+cUdMnLvUxKNqLUzJvgIziQ0DiF3JwSImNphIqdGqzj6hIKyX04MmV0poclQ7+wjWvxQyR2A==
 
 core-util-is@1.0.2, core-util-is@~1.0.0:
   version "1.0.2"