[FSSDK-11494] fix UserAttributes type #1170

Job	Run time
lint	1m 22s
unit_tests (18)	2m 1s
unit_tests (20)	1m 53s
unit_tests (22)	1m 48s
fullstack_production_suite / test	5s
integration_tests / test	5s
lint_markdown_files / lint	1m 1s
Coveralls coverage	4s
	8m 19s

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