fix test breakage

Author: ifsheldon

async-openai/src/embedding.rs

@@ -166,6 +166,7 @@ mod tests {
     #[tokio::test]
     #[cfg(not(feature = "byot"))]
     async fn test_cannot_use_base64_encoding_with_normal_create_request() {
+        use crate::error::OpenAIError;
         let client = Client::new();
 
         const MODEL: &str = "text-embedding-ada-002";