Fix Error Invalid input error: I/O operation on closed file.

Thanks to @petermg

https://github.com/erew123/alltalk_tts/issues/501#issuecomment-2829142969

script.py

@@ -2039,7 +2039,7 @@ def process_audio_files(
                     "processing_date": datetime.now().isoformat(),
                     "validation_messages": validation_messages,
                 },
-                f,
+                file,
                 indent=4,
             )