fix: DictSupplementaryFileContainer increment refcount in _assign_uni… #1222

Job	Run time
server-repository-docker	50s
sdk-package	17s
compliance-tool-static-analysis	20s
sdk-docs	29s
compliance-tool-package	17s
server-static-analysis	30s
sdk-static-analysis	26s
repository-check-copyright	15s
sdk-readme-codeblocks	28s
sdk-test (3.10)	31s
sdk-test (3.12)	32s
check-python-versions	11s
	5m 6s

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