Fix failing `MyGemma2Embedding` test (#13820)

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

tests/plugins/vllm_add_dummy_model/vllm_add_dummy_model/my_gemma_embedding.py

 # SPDX-License-Identifier: Apache-2.0
 
-from typing import Iterable, List, Optional, Tuple, Union
+from typing import Iterable, Optional, Tuple, Union
 
 import torch
 import torch.nn as nn
 
-from vllm.attention import AttentionMetadata
 from vllm.config import VllmConfig
 from vllm.model_executor.layers.pooler import Pooler, PoolingType
 from vllm.model_executor.models.gemma2 import Gemma2Model
@@ -37,16 +36,12 @@ class MyGemma2Embedding(nn.Module):
         self,
         input_ids: torch.Tensor,
         positions: torch.Tensor,
-        kv_caches: List[torch.Tensor],
-        attn_metadata: AttentionMetadata,
         intermediate_tensors: Optional[IntermediateTensors] = None,
         inputs_embeds: Optional[torch.Tensor] = None,
     ) -> Union[torch.Tensor, IntermediateTensors]:
         hidden_states = self.model(
             input_ids,
             positions,
-            kv_caches,
-            attn_metadata,
             intermediate_tensors=intermediate_tensors,
             inputs_embeds=inputs_embeds,
         )