Update test

Author: DougGregor

test/api-digester/stability-concurrency-abi.test

@@ -128,6 +128,8 @@ Func withThrowingTaskGroup(of:returning:body:) has parameter 2 type change from
 Func withTaskGroup(of:returning:body:) has been renamed to Func withTaskGroup(of:returning:isolation:body:)
 Func withTaskGroup(of:returning:body:) has mangled name changing from '_Concurrency.withTaskGroup<A, B where A: Swift.Sendable>(of: A.Type, returning: B.Type, body: (inout Swift.TaskGroup<A>) async -> B) async -> B' to '_Concurrency.withTaskGroup<A, B where A: Swift.Sendable>(of: A.Type, returning: B.Type, isolation: isolated Swift.Optional<Swift.Actor>, body: (inout Swift.TaskGroup<A>) async -> B) async -> B'
 
+Func pthread_main_np() is a new API without '@available'
+
 // *** DO NOT DISABLE OR XFAIL THIS TEST. *** (See comment above.)