fix(vertex): update model version check for text embedding (#1184)

Author: mdrxy

libs/vertexai/langchain_google_vertexai/embeddings.py

@@ -90,7 +90,7 @@ def _missing_(cls, value: Any) -> "GoogleEmbeddingModelVersion":
         if "textembedding-gecko@003" in value.lower():
             return GoogleEmbeddingModelVersion.EMBEDDINGS_DEC_2023
         if (
-            "gemini-embedding-001" in value.lower()
+            "text-embedding-004" in value.lower()
             or "text-multilingual-embedding-002" in value.lower()
             or "text-embedding-preview-0409" in value.lower()
             or "text-multilingual-embedding-preview-0409" in value.lower()