Update dependency core-js to v3.21.0

This MR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
core-js	3.20.3 -> 3.21.0

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Release Notes

zloirock/core-js

v3.21.0

Compare Source

• Added Base64 utility methods:
  • atob
  • btoa
• Added the proper validation of arguments to some methods from web standards
• Forced replacement of all features from early-stage proposals for avoiding possible web compatibility issues in the future
• Added Rhino 1.7.14 compat data
• Added Deno 1.19 compat data mapping
• Added Opera Android 66 and 67 compat data mapping
• Added iOS Safari 15.3 and 15.4 compat data mapping

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added dependencies label

assigned to @Griefed

mentioned in issue #2 (closed)

changed the description

merged