[Snyk] Upgrade core-js from 2.6.9 to 2.6.12

[doublej42]

This PR was automatically created by Snyk using the credentials of a real user.

Snyk has created this PR to upgrade core-js from 2.6.9 to 2.6.12.

ℹ️ Keep your dependencies up-to-date. This makes it easier to fix existing vulnerabilities and to more quickly identify and fix newly disclosed vulnerabilities when they affect your project.

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• The recommended version is 3 versions ahead of your current version.
• The recommended version was released a year ago, on 2020-11-25.

Release notes

Package name: core-js

• 2.6.12 - 2020-11-25
  
  • Added code points / code units explicit feature detection in String#at for preventing breakage code which use obsolete String#at proposal polyfill
  • Added OPEN_SOURCE_CONTRIBUTOR detection in postinstall
  • Added Drone CI detection in postinstall
• 2.6.11 - 2019-12-08
• 2.6.10 - 2019-10-13
• 2.6.9 - 2019-05-27

from core-js GitHub release notes

Commit messages

Package name: core-js

• ffb783b 2.6.12
• 64a3b44 make tests pass with the modern `String#matchAll`
• e0c9827 add code points / code units explicit feature detection in `String#at` for preventing breakage code which use obsolete `String#at` proposal polyfill
• 160e61a update the `postinstall` script
• 4cfb0ec 2.6.11
• 758181c improve the `postinstall` script
• 24d1eaa 2.6.10
• a13dc99 update the `postinstall` message
• acc4793 backport the latest `postinstall` script related changes

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