Update embeddings.py (langchain-ai#164)

Update embeddings.py to support new text-embedding models

Co-authored-by: Leonid Kuligin <[email protected]>

libs/vertexai/langchain_google_vertexai/embeddings.py

@@ -44,7 +44,7 @@ class GoogleEmbeddingModelType(str, Enum):
 
     @classmethod
     def _missing_(cls, value: Any) -> Optional["GoogleEmbeddingModelType"]:
-        if "textembedding-gecko" in value.lower():
+        if value.lower().startswith("text"):
             return GoogleEmbeddingModelType.TEXT
         elif "multimodalembedding" in value.lower():
             return GoogleEmbeddingModelType.MULTIMODAL