[FLINK-37437][state/forst] Bump forstjni version to 0.1.8 #1788

Job	Run time
Default (Java 17) / Compile	32m 56s
Pre-compile Checks / Basic QA	7m 53s
Default (Java 17) / Test packaging/licensing	37m 3s
Default (Java 17) / E2E (group 1)	2h 0m 15s
Default (Java 17) / Test (module: core)	27m 12s
Default (Java 17) / E2E (group 2)	2h 28m 6s
Default (Java 17) / Test (module: python)	28m 50s
Default (Java 17) / Test (module: table)	36m 18s
Default (Java 17) / Test (module: connect)	18m 54s
Default (Java 17) / Test (module: tests)	33m 16s
Default (Java 17) / Test (module: misc)	24m 8s
	8h 34m 51s

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