[CI] upgrade vllm to 0.8.5 (#715)

1. Upgrade vllm to 0.8.5
2. Drop 0.8.4 support
3. Keep doc to 0.8.4rc2 until we release 0.8.5

Signed-off-by: wangxiyuan <wangxiyuan1007@gmail.com>

vllm_ascend/worker/worker.py

@@ -28,6 +28,7 @@ from vllm.config import VllmConfig, set_current_vllm_config
 from vllm.distributed import (ensure_model_parallel_initialized,
                               init_distributed_environment,
                               set_custom_all_reduce)
+from vllm.distributed.kv_transfer import ensure_kv_transfer_initialized
 from vllm.logger import logger
 from vllm.lora.request import LoRARequest
 from vllm.model_executor import set_random_seed
@@ -46,15 +47,10 @@ from vllm.worker.worker_base import (LocalOrDistributedWorkerBase, WorkerBase,
 from vllm_ascend.device_allocator.camem import CaMemAllocator
 from vllm_ascend.distributed.parallel_state import init_ascend_model_parallel
 from vllm_ascend.platform import NPUPlatform
-from vllm_ascend.utils import try_register_lib, vllm_version_is
+from vllm_ascend.utils import try_register_lib
 from vllm_ascend.worker.model_runner import NPUModelRunner
 from vllm_ascend.worker.pooling_model_runner import NPUPoolingModelRunner
 
-if vllm_version_is("0.8.4"):
-    from vllm.distributed import ensure_kv_transfer_initialized
-else:
-    from vllm.distributed.kv_transfer import ensure_kv_transfer_initialized
-
 
 class NPUWorker(LocalOrDistributedWorkerBase):
     """A worker class that executes (a partition of) the model on a NPU.