sdk: fix langtag constraints in LangStringSet (#478) #1103

Job	Run time
compliance-tool-test (3.10)	32s
compliance-tool-test (3.12)	31s
sdk-test (3.12)	32s
repository-check-copyright	16s
sdk-static-analysis	28s
server-static-analysis	28s
compliance-tool-package	14s
sdk-package	12s
sdk-test (3.10)	31s
compliance-tool-static-analysis	21s
sdk-docs	25s
server-repository-docker	54s
check-python-versions	9s
sdk-readme-codeblocks	22s
	5m 55s

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