Bump core-js from 3.8.3 to 3.14.0 in /frontend

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Bumps core-js from 3.8.3 to 3.14.0.

Changelog

Sourced from core-js's changelog.

3.14.0 - 2021.06.05

• Added polyfill of stable sort in { Array, %TypedArray% }.prototype.sort, #769, #941
• Fixed Safari 14.0- %TypedArray%.prototype.sort validation of arguments bug
• .at marked as supported from V8 9.2

3.13.1 - 2021.05.29

• Overwrites get-own-property-symbols third-party Symbol polyfill if it's used since it causes a stack overflow, #774
• Added a workaround of possible browser crash on Object.prototype accessors methods in WebKit ~ Android 4.0, #232

3.13.0 - 2021.05.26

• Accessible Object#hasOwnProperty (Object.hasOwn) proposal moved to the stage 3, May 2021 TC39 meeting

3.12.1 - 2021.05.09

• Fixed some cases of Function#toString with multiple core-js instances
• Fixed some possible String#split polyfill problems in V8 5.1

3.12.0 - 2021.05.06

• Added well-known symbol Symbol.metadata for decorators stage 2 proposal
• Added well-known symbol Symbol.matcher for pattern matching stage 1 proposal
• Fixed regression of V8 ~ Node 0.12 String(Symbol()) bug, #933

3.11.3 - 2021.05.05

• Native promise-based APIs Promise#{ catch, finally } returns polyfilled Promise instances when it's required

3.11.2 - 2021.05.03

• Added a workaround of WebKit ~ iOS 10.3 Safari Promise bug, #932
• Promise#then of incorrect native Promise implementations with correct subclassing no longer wrapped
• Changed the order of Promise feature detection, removed unhandled rejection tracking check in non-browser non-node platforms

3.11.1 - 2021.04.28

• Made instanceof Promise and .constructor === Promise work with polyfilled Promise for all native promise-based APIs
• Added a workaround for some buggy V8 versions ~4.5 related to fixing of %TypedArray% static methods, #564

3.11.0 - 2021.04.22

• Added accessible Object#hasOwnProperty stage 2 proposal
  • Object.hasOwn method
• Fixed a possible RegExp constructor problem with multiple global core-js instances

3.10.2 - 2021.04.19

• URL and URLSearchParams marked as supported from Safari 14.0
• Polyfilled built-in constructors protected from calling on instances

3.10.1 - 2021.04.08

• Prevented possible RegExp#split problems in old engines, #751, #919
• Detection of Safari 10 string padding bug extended to some Safari-based browsers

3.10.0 - 2021.03.31

• Array find from last proposal moved to the stage 2, March TC39 meeting
• Prevented possible RegExp#exec problems in some old engines, #920
• Updated compat data mapping:

... (truncated)

Commits

• e386f3d 3.14.0
• fb75c0a some improvements
• 586d578 make %TypedArray%.prototype.sort stricter
• 07ca565 update compat data tests
• e7e81d8 Safari 10.0 - 14.0 %TypedArray%.prototype.sort accept incorrect arguments
• 8b56b38 improve polyfill of stable sort
• ae0cd69 add polyfill of stable sort
• a05c21c 3.13.1
• c2b4e64 no longer use symbols from get-own-property-symbols polyfill, close #774
• 47d11d0 added a workaround of possible browser crash on Object.prototype accessors ...
• Additional commits viewable in compare view

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