Bump core-js from 3.12.0 to 3.12.1 in /ui

Created by: dependabot[bot]

Bumps core-js from 3.12.0 to 3.12.1.

Changelog

Sourced from core-js's changelog.

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

Commits

• 8752e69 3.12.1
• 3eb4159 fix some possible String#split polyfill problems in V8 5.1
• 1789d3e fix some cases of Function#toString with multiple core-js instances
• c7170fb update eslint-plugin-regexp
• See full diff in compare view

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