Update poetry lock (#1209)

* Update the version of llama_index used to fix transient openai errors

* Update poetry.lock file

* Make `local` mode the default mode by default

private_gpt/server/embeddings/embeddings_service.py

@@ -1,3 +1,5 @@
+from typing import Literal
+
 from injector import inject, singleton
 from pydantic import BaseModel, Field
 
@@ -6,7 +8,7 @@ from private_gpt.components.embedding.embedding_component import EmbeddingCompon
 
 class Embedding(BaseModel):
     index: int
-    object: str = Field(enum=["embedding"])
+    object: Literal["embedding"]
     embedding: list[float] = Field(examples=[[0.0023064255, -0.009327292]])