feat: support django >= 2.2.17 < 3

[thibaut-lo]

Main change

Add support to django 2.2

Loft Internal: pre-requisite for migration of django 2 services to graphene v3

Other changes

I had to batch replace py.test by pytest for make tests to pass locally. :

• Main reason is

those libraries (here: Graphene-django) use the py library but they do not explicitly have py listed in their dependencies, relying on the fact that pytest itself depended on py until 7.2. This is not a good practice, as libraries should explicitly list all the dependencies that they use directly, and not rely on transitive dependencies from other packages.

There are two possible fixes to be done on those libraries:

• Change usages from py.test to pytest (recommended).
• Add py explicitly to their dependencies.
  Backward compatibility of pytest 7.2.0 and import py.test pytest-dev/pytest#10459 (comment)

• This has also been applied in the main graphene-django repo last month. Ref: graphene-django commit: graphql-python@86c5309

[thibaut-lo]

fyi - only version supporting both 2.2 and 4,x

[thibaut-lo]

fyi - support from 2.2 to 4 django

[thibaut-lo]

fyi - doesn't support python 3.9 below 2.2.17 and both GSC and SO are above that one.

[thibaut-lo]

I wasn't successful in debugging that failed test. It was passing before without much change to the branch.

[thibaut-lo]

On hold because the end use case in my organization (upgrade of a micro-service to graphene v3) with django 2 is on hold.