Unpaper PermissionError: The process cannot access the file because it is being used by another process

[MatteoMass]

Describe the bug
Can't use option deskew, clean and clean_final in the ocrmypdf.ocr() method, it returns the error in the title specifically for a temporary file called "output.pgm". This file is not used by any other process.

To Reproduce
title_in = temp_folder_image2pdf+"IMAGE_TEMP.jpg"
image = images[0]
image.save(title_in, "JPEG")
image.close()
title_out = temp_folder_image2pdf+"img2pdf.pdf"
ocrmypdf.ocr(title_in, title_out, language="ita", deskew=True, clean=True, clean_final=True, image_dpi=300)

Expected behavior
Resulting OCR of the input image

Screenshots

System (please complete the following information):

• OS: Windows 10
• Python version: 3.8.8
• OCRmyPDF version: 13.4.3
• Unpaper version: 6.1

Installation
OCRmyPDF was installed using pip, while Unpaper using chocolatey.

[jbarlow83]

After analysis it turns this is a Python issue:
https://bugs.python.org/issue35144

The solution is to upgrade to Python 3.10, the only released version with the fix available
python/cpython#24793
in addition this requires a change to ocrmypdf to take advantage of the new version.

I suspect it's actually a virus scanner process triggering this issue.