Update launchdarkly-java-server-sdk to 7.7.0 #355

Job	Run time
Submit Dependencies	0s
Build and Test (ubuntu-latest, 2.13, temurin@8, rootJVM)	4s
Build and Test (ubuntu-latest, 3, temurin@8, rootJVM)	4s
Generate Site (ubuntu-latest, temurin@11)	8s
Publish Artifacts	0s
	16s

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