refactor: Update VertexAIEmbeddingsComponent to use Embeddings field type

Update the VertexAIEmbeddingsComponent to use the `Embeddings` field type instead of importing it from `langchain_google_vertexai`. This ensures compatibility with the latest version of the langflow library and improves code readability.

src/backend/base/langflow/components/embeddings/VertexAIEmbeddings.py

@@ -1,8 +1,7 @@
 from typing import List, Optional
 
-from langchain_google_vertexai import VertexAIEmbeddings
-
 from langflow.custom import CustomComponent
+from langflow.field_typing import Embeddings
 
 
 class VertexAIEmbeddingsComponent(CustomComponent):
@@ -71,7 +70,14 @@ class VertexAIEmbeddingsComponent(CustomComponent):
         temperature: float = 0.0,
         top_k: int = 40,
         top_p: float = 0.95,
-    ) -> VertexAIEmbeddings:
+    ) -> Embeddings:
+        try:
+            from langchain_google_vertexai import VertexAIEmbeddings
+        except ImportError:
+            raise ImportError(
+                "Please install the langchain-google-vertexai package to use the VertexAIEmbeddings component."
+            )
+
         return VertexAIEmbeddings(
             instance=instance,
             credentials=credentials,