Replace shutil.move with shutil.copy2, to avoid a permission error on Windows

[ptormene]

This should prevent errors like:

Traceback (most recent call last):
  File "C:\Users\iklab\AppData\Roaming\Python\Python311\site-packages\openquake\server\views.py", line 1483, in submit_job
    job_ini = store(request_files, ini, job.calc_id)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\iklab\AppData\Roaming\Python\Python311\site-packages\openquake\server\views.py", line 224, in store
    shutil.move(input_file.temporary_file_path(), new_path)
  File "C:\Users\iklab\AppData\Local\Programs\OpenQuake Engine\python3\Lib\shutil.py", line 846, in move
    os.unlink(src)
PermissionError: [WinError 32] The process cannot access the file because it is being used by another process: 'C:\\Users\\iklab\\AppData\\Local\\Temp\\_o1kbw_5.upload'

We checked with @vot4anto on a Windows machine that this actually fixes the issue.

Changing shutil.move to shutil.copy2, Django deletes the temporary file when the request ends, instead of attempting to delete it immediately when it is still in use by the Django process.

[vot4anto]

LGTM