Revert "Bump core-js to v3.45" #819

Job	Run time
Lint Code Base / yaml-linter	6s
Lint Code Base / style-linter	23s
Lint Code Base / json-linter	29s
Lint Code Base / ecmascript-linter	28s
Build assets	39s
Determine next version	0s
Commit changes to assets	0s
Cleanup artifacts	4s
	2m 9s

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