Main2main upgrade vllm commit to 03 19 17:00 (#7478)

### What this PR does / why we need it?
Upgrade vllm commit to 2026.03.19.

1.Fix socket removed from StatelessProcessGroup. Upstream vLLM PR
[#36330](https://github.com/vllm-project/vllm/pull/36330) ("elastic_ep:
Fix stateless group port races") refactored StatelessProcessGroup and
removed the socket: socket.socket | None field. The socket ownership was
moved to a new create_tcp_store() helper instead of being stored as a
field on the dataclass.

2.fix `virtual_engine` parameter removed from `set_forward_context().
Upstream [V0 Deprecation] Deprecate virtual engine
[#37195](https://github.com/vllm-project/vllm/pull/37195)

### Does this PR introduce _any_ user-facing change?
NA

### How was this patch tested?
NA

- vLLM version: v0.17.0
- vLLM main:
8b6325758c

---------

Signed-off-by: leo-pony <nengjunma@outlook.com>

vllm_ascend/ops/mla.py

@@ -33,7 +33,7 @@ from vllm.v1.attention.backend import AttentionMetadata  # type: ignore
 
 from vllm_ascend.ascend_config import get_ascend_config
 from vllm_ascend.ascend_forward_context import _EXTRA_CTX
-from vllm_ascend.utils import is_vl_model, parse_layer_idx
+from vllm_ascend.utils import is_vl_model, parse_layer_idx, vllm_version_is
 
 
 class IndexerWrapper(nn.Module):
@@ -183,7 +183,7 @@ def mla_forward(
         attn_metadata = forward_context.attn_metadata[self.mla_attn.layer_name]
     else:
         attn_metadata = forward_context.attn_metadata
-    kv_cache = self.mla_attn.kv_cache[forward_context.virtual_engine]
+    kv_cache = self.mla_attn.kv_cache[forward_context.virtual_engine if vllm_version_is("0.18.0") else 0]
     self.mla_attn.impl.forward(
         self.mla_attn.layer_name, hidden_states, kv_cache, attn_metadata, need_gather_q_kv, output
     )