Fixs error when translated caption contains an unusual byte

fixs this
File "D:\EveryDream2trainer\caption_cog.py", line 143, in main
    f.write(caption)
UnicodeEncodeError: 'cp949' codec can't encode character '\xe9' in position 333: illegal multibyte sequence

caption_cog.py

@@ -139,7 +139,7 @@ def main(args):
             caption = tokenizer.decode(outputs_without_prompt[0], skip_special_tokens=True)
             caption += args.append
 
-            with open(candidate_caption_path, "w") as f:
+            with open(candidate_caption_path, "w", encoding="utf-8") as f:
                 f.write(caption)
             vram_gb = get_gpu_memory_map()
             elapsed_time = time.time() - start_time