[Snyk] Upgrade core-js from 2.5.5 to 2.6.12

[snyk-bot]

Snyk has created this PR to upgrade core-js from 2.5.5 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 15 versions ahead of your current version.
• The recommended version was released a year ago, on 2020-11-25.

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
• 6a3fe85 2.6.9
• 0cb83b3 backport changes in the postinstall script
• bab1a28 2.6.8
• 9c6871a add a workaround of a strange `npx` bug on `postinstall`, fix #551
• db3c19e 2.6.7
• ea84174 backport #549
• 34eb949 add an additional check of native `Symbol`
• ada1588 fix links to `#raising-funds` section
• 883f5fe 2.6.6
• eae0710 update readme
• 1d77ba0 show a message on postinstall
• 40df8cf backport fixes for #539
• b362f91 backport fixes for #541
• e778e80 2.6.5
• 990ae2f fix buggy String#padStart and String#padEnd mobile Safari implementations, backport of https://github.com/zloirock/core-js/commit/16dbccf66f0400e16d6bcb3943dddfdedd98fe66

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