fix(deps): update dependency core-js to v3.15.0

This MR contains the following updates:

Package	Type	Update	Change
core-js	dependencies	minor	3.14.0 -> 3.15.0

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Release Notes

zloirock/core-js

v3.15.0

Compare Source

• Added RegExp named capture groups polyfill, #​521, #​944
• Added RegExp dotAll flag polyfill, #​792, #​944
• Added missed polyfills of Annex B features (required mainly for some non-browser engines), #​336, #​945:
  • escape
  • unescape
  • String.prototype.substr
  • Date.prototype.getYear
  • Date.prototype.setYear
  • Date.prototype.toGMTString
• Fixed detection of forbidden host code points in URL polyfill
• Allowed rhino target in core-js-compat / core-js-builder, added compat data for rhino 1.7.13, #​942, thanks @​gausie
• .at marked as supported from FF90

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