make app compatible with django 3 changes

[nKandel]

need to update six import location in order to make it compatible with django 3.

replace from django.utils.six.moves.urllib import parse as urlparse with from six.moves.urllib import parse as urlparse at storage file

line from django 3 release page:

django.utils.six - Remove usage of this vendored library or switch to six.

[nKandel]

Additional changes required for Django 4 in the storage file.

from django.utils.encoding import force_str as force_text 
from urllib.parse import quote as urlquote
from six.moves.urllib import parse as urlparse

[jacobwegner]

Thanks @nKandel.

I think this repo is overdue to be marked as read-only.

I'll see if I can write a small migration document from this library to django-storages, which has received ongoing maintenance.

The biggest change between django-gapc-storage and django-storages with the GoogleCloudStorage backend is that the GS_FILE_OVERWRITE setting defaults to True, where the allow_overwrite setting on this project defaults to False:

https://github.com/eldarion/django-gapc-storage/blob/master/gapc_storage/storage.py#L69

I would recommend using GS_FILE_OVERWRITE=False if migrating to django-storages.

[nKandel]

Hi @jacobwegner. Thank you very much for the prompt reply. A migration guideline would be a huge help. For someone who isn't familiar with the django-storages and django-gpac-storage internal codebases, it would provide the needed clarity.