Update dependency core-js to v3.12.1

This MR contains the following updates:

Package	Type	Update	Change
core-js	dependencies	patch	3.12.0 -> 3.12.1

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Release Notes

zloirock/core-js

v3.12.1

Compare Source

• Fixed some cases of Function#toString with multiple core-js instances
• Fixed some possible String#split polyfill problems in V8 5.1

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