Bump core-js from 3.16.3 to 3.16.4 in /ui

Created by: dependabot[bot]

Bumps core-js from 3.16.3 to 3.16.4.

Changelog

Sourced from core-js's changelog.

3.16.4 - 2021.08.29

• AsyncFromSyncIterator made stricter, related mainly to AsyncIterator.from and AsyncIterator.prototype.flatMap
• Handling of optional .next arguments in (Async)Iterator methods is aligned with the current spec draft (mainly - ignoring the first passed to .next argument in built-in generators)
• Behavior of .next, .return, .throw methods on AsyncIterator helpers proxy iterators aligned with the current spec draft (built-in async generators) (mainly - some early errors moved to returned promises)
• Fixed some cases of safe iteration closing
• Fixed dependencies of some entry points

Commits

• eaf15af 3.16.4
• 6b61dcf fix some missed dependencies
• 21bb08d fix some cases of safe iteration closing
• 9b260b3 move generators validation to promises
• b7edd2a fix .return
• 322be73 behavior of .next, .return, .throw methods on AsyncIterator helpers p...
• 8df6d0e align handling of optional .next arguments in (Async)Iterator methods wit...
• 0f1bc28 refactor to use getIteratorMethod + getIterator in some cases
• 5bb48b3 prevent double get of @@(async)iterator property
• 9773ec3 remove unnecessary check
• Additional commits viewable in compare view

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