change response type of createdAt

Author: narengogi

src/providers/google-vertex-ai/imageGenerate.ts

@@ -153,7 +153,7 @@ export const GoogleImageGenResponseTransform: (
 
   if ('predictions' in response) {
     return {
-      created: `${new Date().getTime()}`,
+      created: Math.floor(Date.now() / 1000),
       data: response.predictions.map((generation) => ({
         b64_json: generation.bytesBase64Encoded,
       })),