Bump core-js from 2.6.5 to 2.6.6

Bumps [core-js](https://github.com/zloirock/core-js) from 2.6.5 to 2.6.6.
- [Release notes](https://github.com/zloirock/core-js/releases)
- [Changelog](https://github.com/zloirock/core-js/blob/master/CHANGELOG.md)
- [Commits](https://github.com/zloirock/core-js/compare/v2.6.5...v2.6.6)
Signed-off-by: dependabot[bot] <support@dependabot.com>

yarn.lock

@@ -2299,9 +2299,9 @@ core-js@3.0.0:
   integrity sha512-WBmxlgH2122EzEJ6GH8o9L/FeoUKxxxZ6q6VUxoTlsE4EvbTWKJb447eyVxTEuq0LpXjlq/kCB2qgBvsYRkLvQ==
 
 core-js@^2.2.0, core-js@^2.4.0, core-js@^2.5.0, core-js@^2.5.7:
-  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 "2.6.6"
+  resolved "https://registry.yarnpkg.com/core-js/-/core-js-2.6.6.tgz#00eb6d6bf815471cc16d8563edd7d38786dec50b"
+  integrity sha512-Mt/LaAym54NXnrjEMdo918cT2h70tqb/Yl7T3uPHQHRm5SxVoqlKmerUy4mL11k8saSBDWQ7ULIHxmeFyT3pfg==
 
 core-util-is@1.0.2, core-util-is@~1.0.0:
   version "1.0.2"