Bump core-js from 3.14.0 to 3.15.0

[dependabot[bot]]

Bumps core-js from 3.14.0 to 3.15.0.

Changelog

Sourced from core-js's changelog.

3.15.0 - 2021.06.21

• 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

Commits

• 4f7f304 3.15.0
• 219b688 fix dotAll entry
• bae33e0 revert test of delegation to .exec().groups in .replace
• 9a91e18 some stylistic changes
• bccff54 some protections
• e485690 some improvements
• f7b619d simplify fix-regexp-well-known-symbol-logic
• 3646a74 some improvements
• 3f5640c untangle fix-regexp-well-known-symbol-logic by moving feature detection to ...
• 1a510ac add basic NCG support
• Additional commits viewable in compare view

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[dependabot[bot]]

Superseded by #461.