fix: Update test_server.py

[cpacker]

Loosen test to fix non-deterministic unit test, eg see failure in: https://github.com/cpacker/MemGPT/actions/runs/8544849064/job/23411836736

        assert passages_1[0]["text"] == "alpha"
>       assert len(passages_2) == 3
E       AssertionError: assert 4 == 3
E        +  where 4 = len([{'agent_id': UUID('48249189-c3d0-490f-a3ea-b0f4a6336518'), 'created_at': datetime.datetime(2024, 4, 3, 20, 8, 21, 422464, tzinfo=datetime.timezone.utc), 'data_source': 'test_source', 'doc_id': UUID('c4f43552-5cee-cf6b-cd4f-667287a2a23f'), ...}, {'agent_id': UUID('48249189-c3d0-490f-a3ea-b0f4a6336518'), 'created_at': datetime.datetime(2024, 4, 3, 20, 8, 55, 972034, tzinfo=datetime.timezone.utc), 'data_source': None, 'doc_id': None, ...}, {'agent_id': UUID('48249189-c3d0-490f-a3ea-b0f4a6336518'), 'created_at': datetime.datetime(2024, 4, 3, 20, 8, 21, 689716, tzinfo=datetime.timezone.utc), 'data_source': 'test_source', 'doc_id': UUID('aa188965-821d-3c57-ff38-d911514ca632'), ...}, {'agent_id': UUID('48249189-c3d0-490f-a3ea-b0f4a6336518'), 'created_at': datetime.datetime(2024, 4, 3, 20, 8, 21, 572660, tzinfo=datetime.timezone.utc), 'data_source': 'test_source', 'doc_id': UUID('e1a06b72-6d11-3a7c-2623-fc48d72da8e9'), ...}])