Update dependency core-js to v3.20.1

This MR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
core-js	3.20.0 -> 3.20.1

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Release Notes

zloirock/core-js

v3.20.1

Compare Source

• Fixed the order of calling reactions of already fulfilled / rejected promises in Promise.prototype.then, #​1026
• Fixed possible memory leaking in specific promise chains
• Fixed some missed dependencies of entries
• Added Deno 1.18 compat data mapping

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