python3Packages.django-cryptography: include missing source files

[centromere]

Description of changes

Some source files are missing from the package. This change ensures they are included.

Before:

$ find result/lib/python3.10/site-packages/django_cryptography | grep -v pycache
result/lib/python3.10/site-packages/django_cryptography
result/lib/python3.10/site-packages/django_cryptography/fields.py
result/lib/python3.10/site-packages/django_cryptography/conf.py
result/lib/python3.10/site-packages/django_cryptography/__init__.py

After:

$ find result/lib/python3.10/site-packages/django_cryptography | grep -v pycache
result/lib/python3.10/site-packages/django_cryptography
result/lib/python3.10/site-packages/django_cryptography/core
result/lib/python3.10/site-packages/django_cryptography/core/signing.py
result/lib/python3.10/site-packages/django_cryptography/core/__init__.py
result/lib/python3.10/site-packages/django_cryptography/fields.py
result/lib/python3.10/site-packages/django_cryptography/conf.py
result/lib/python3.10/site-packages/django_cryptography/__init__.py
result/lib/python3.10/site-packages/django_cryptography/utils
result/lib/python3.10/site-packages/django_cryptography/utils/__init__.py
result/lib/python3.10/site-packages/django_cryptography/utils/crypto.py

Things done

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• For non-Linux: Is sandbox = true set in nix.conf? (See Nix manual)
• Tested, as applicable:
  • NixOS test(s) (look inside nixos/tests)
  • and/or package tests
  • or, for functions and "core" functionality, tests in lib/tests or pkgs/test
  • made sure NixOS tests are linked to the relevant packages
• Tested compilation of all packages that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage
• Tested basic functionality of all binary files (usually in ./result/bin/)
• 23.05 Release Notes (or backporting 22.11 Release notes)
  • (Package updates) Added a release notes entry if the change is major or breaking
  • (Module updates) Added a release notes entry if the change is significant
  • (Module addition) Added a release notes entry if adding a new NixOS module
• Fits CONTRIBUTING.md.

[nixos-discourse]

This pull request has been mentioned on NixOS Discourse. There might be relevant details there:

https://discourse.nixos.org/t/prs-ready-for-review/3032/2183

[SuperSandro2000]

Can we fetch georgemarshall/django-cryptography#88 instead?

[centromere]

@SuperSandro2000 The raw upstream patch did not apply properly, so I generated one and included it in this PR.

[SuperSandro2000]

@ofborg build python310Packages.django-cryptography