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Fix issue with MapClaims VerifyAudience string ( 12)

Fix issue with MapClaims VerifyAudience string ( 12): a task in repo2rlenv-commit-runtime-v2 (Harbor dataset). Title: MapClaims VerifyAudience incorrectly returns true for string audience when required is false

The task

**Title:** MapClaims VerifyAudience incorrectly returns true for `[]string` audience when `required` is false

Part of FineEnvs/repo2rlenv-commit-runtime.