fix(deps): update dependency core-js to v2.6.12

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
core-js	2.6.9 -> 2.6.12

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Release Notes

zloirock/core-js

v2.6.12

Compare Source

• 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

v2.6.11

Compare Source

• Returned usage of node -e in the postinstall scripts for better cross-platform compatibility, #​582
• Improved CI detection in the postinstall script, #​707

v2.6.10

Compare Source

• Show similar postinstall messages only once per npm i, #​597

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