Update dependency core-js to v3.4.4

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
core-js	dependencies	patch	3.4.2 -> 3.4.4

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Release Notes

zloirock/core-js

v3.4.4

Compare Source

• Added feature detection for Safari non-generic Promise#finally bug (critical for core-js-pure)
• Fixed missed esnext.string.code-points in core-js/features/string entry point
• Updated Iterator proposal feature detection for the case of non-standard Iterator in FF44-

v3.4.3

Compare Source

• Fixed missed es.json.stringify and some modules from iteration helpers proposal in some entry points (includes the root entry point)
• 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

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