[FSSDK-11494] fix UserAttributes type #1171

Job	Run time
lint	1m 25s
unit_tests (18)	2m 4s
unit_tests (20)	1m 49s
unit_tests (22)	1m 51s
integration_tests / test	6s
fullstack_production_suite / test	4s
lint_markdown_files / lint	53s
Coveralls coverage	3s
	8m 15s

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