Fix windows implementation of the parquet implementation

The parquet implementation was giving me the following error on windows (works on linux) `[Windows error 32] The process cannot access the file because it is being used by another process.`
I was able to fix it using the above code, I also removed the f'string from the print statement.

app_parquet.py

@@ -1,5 +1,6 @@
 # Taken from https://huggingface.co/spaces/hysts-samples/save-user-preferences
 # Credits to @@hysts
+import os
 import datetime
 import json
 import shutil
@@ -135,8 +136,9 @@ class ParquetScheduler(CommitScheduler):
         )
 
         # Write to parquet file
-        archive_file = tempfile.NamedTemporaryFile()
+        archive_file = tempfile.NamedTemporaryFile(delete=False)
         pq.write_table(table, archive_file.name)
+        archive_file.close()
 
         # Upload
         self.api.upload_file(
@@ -146,10 +148,10 @@ class ParquetScheduler(CommitScheduler):
             path_in_repo=f"{uuid.uuid4()}.parquet",
             path_or_fileobj=archive_file.name,
         )
-        print(f"Commit completed.")
+        print("Commit completed.")
 
         # Cleanup
-        archive_file.close()
+        os.unlink(archive_file.name)
         for path in path_to_cleanup:
             path.unlink(missing_ok=True)