Add support for Django 4.1 and 4.2

[Hopiu]

So, now I got it all together, here are the changes I implemented for supporting Django 4.1 and 4.2:

Changes:

• Add Django 4.1 and 4.2 to test matrix in GitHub workflow
• Add Python 3.11 to test matrix in GitHub workflow
• Add possibility to manually run GitHub workflow
• Refactor UserAgreementMiddleware to use parent constructor and update test
• get_response is now a required argument in the UserAgreementMiddleware constructor
• Update views.py to use get_current_site

Thanks for reviewing

[Hopiu]

I have implemented your suggestions from above in the PR.

[nicholasserra]

Thank you! Tested this against a few versions and LGTM