chore(deps): update dependency core-js to ^3.12.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
core-js	^3.12.0 -> ^3.12.1

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Release Notes

zloirock/core-js

v3.12.1

Compare Source

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

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[codecov]

Codecov Report

Merging #3249 (18b54fb) into master (297a649) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3249   +/-   ##
=======================================
  Coverage   95.38%   95.38%           
=======================================
  Files          34       34           
  Lines        1236     1236           
  Branches      352      352           
=======================================
  Hits         1179     1179           
  Misses         51       51           
  Partials        6        6           

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