Convert formatting to use ruff instead of yapf + isort (#26247)

Signed-off-by: Harry Mellor <19981378+hmellor@users.noreply.github.com>

vllm/model_executor/layers/attention_layer_base.py

@@ -1,6 +1,7 @@
 # SPDX-License-Identifier: Apache-2.0
 # SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 """Base class for attention-like layers."""
+
 from abc import ABC, abstractmethod
 from typing import TYPE_CHECKING
 
@@ -10,10 +11,10 @@ if TYPE_CHECKING:
 
 class AttentionLayerBase(ABC):
     """
-    Base class for attention-like layers (Attention, Mamba, etc.) 
+    Base class for attention-like layers (Attention, Mamba, etc.)
     that support the v1 engine.
-    
-    This provides a common interface for getting attention backends 
+
+    This provides a common interface for getting attention backends
     from different layer types.
     """