Update export_torch_script.py (#2494)

Avoid dtype inconsistency when exporting

GPT_SoVITS/export_torch_script.py

@@ -474,6 +474,10 @@ class T2SModel(nn.Module):
         bert = bert.unsqueeze(0)
 
         x = self.ar_text_embedding(all_phoneme_ids)
+
+        # avoid dtype inconsistency when exporting
+        bert = bert.to(dtype=self.bert_proj.weight.dtype)
+        
         x = x + self.bert_proj(bert.transpose(1, 2))
         x: torch.Tensor = self.ar_text_position(x)