Update dependency core-js to v3.4.3

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
core-js	dependencies	patch	3.4.1 -> 3.4.3

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Release Notes

zloirock/core-js

v3.4.3

Compare Source

• Fixed missed es.json.stringify and some modules from iteration helpers proposal in some entry points
• Added a workaround of String#{ endsWith, startsWith } MDN polyfills bugs, #​702
• Fixed .size property descriptor of Map / Set in the pure version
• Refactoring, some internal improvements

v3.4.2

Compare Source

• Don't use polyfilled symbols as internal uids, a workaround for some incorrect use cases
• String#replaceAll is available only in nightly FF builds
• Improved Promise feature detection for the case of V8 6.6 with multiple core-js copies
• Some internals optimizations
• Added Node 13.2 -> V8 7.9 compat data mapping
• Returned usage of node -e in postinstall scripts

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