Remove pytest from runtime model import

Author: kstonekuan

src/openpi/models_pytorch/gemma_pytorch.py

@@ -1,6 +1,5 @@
 from typing import Literal
 
-import pytest
 import torch
 from torch import nn
 from transformers import GemmaForCausalLM
@@ -92,7 +91,7 @@ def forward(
         self,
         attention_mask: torch.Tensor | None = None,
         position_ids: torch.LongTensor | None = None,
-        past_key_values: list[torch.FloatTensor] | pytest.Cache | None = None,
+        past_key_values: list[torch.FloatTensor] | None = None,
         inputs_embeds: list[torch.FloatTensor] | None = None,
         use_cache: bool | None = None,
         adarms_cond: list[torch.Tensor] | None = None,