[deps] Add support for Django 5.0 & 5.1 and Python 3.11, 3.12 & 3.13

[pandafy]

• Drop support for Django 3.2
• Drop support for Python 3.8

Depends on

• [deps] Add support for Django 5.0 & 5.1 and Python 3.11, 3.12 & 3.13 openwisp-utils#439
• [deps] Add support for Django 5.0 & 5.1 and Python 3.11, 3.12 & 3.13 openwisp-users#432
• [deps] Add support for Django 5.0 & 5.1 and Python 3.11, 3.12 & 3.13 openwisp-ipam#184
• [deps] Add support for Django 5.0 & 5.1 and Python 3.11, 3.12 & 3.13 openwisp-notifications#340
• [deps] Add support for Django 5.0 & 5.1 and Python 3.11, 3.12 & 3.13 openwisp-controller#987
• [deps] Add support for Django 5.0 & 5.1 and Python 3.11, 3.12 & 3.13 openwisp-monitoring#645
• [deps] Add support for Python 3.11, 3.12 & 3.13 netdiff#129

[pandafy]

I am working on this.