upgrade to django 5

[durandom]

looks like django-plotly-dash holds us back:

❯ pipdeptree -p Django -r
Warning!!! Possibly conflicting dependencies found:
* botocore==1.34.3
 - urllib3 [required: >=1.25.4,<2.1, installed: 2.1.0]
------------------------------------------------------------------------
Django==4.2.8
├── channels==4.0.0 [requires: Django>=3.2]
│   └── django-plotly-dash==2.2.2 [requires: channels>=2.0]
├── crispy-bootstrap4==2023.1 [requires: Django>=4.2]
├── django-allauth==0.59.0 [requires: Django>=3.2]
├── django-bootstrap-icons==0.8.7 [requires: Django]
├── django-bootstrap4==23.2 [requires: Django>=3.2]
├── django-bootstrap5==23.3 [requires: Django>=3.2]
├── django-crispy-forms==2.1 [requires: Django>=4.2]
│   └── crispy-bootstrap4==2023.1 [requires: django-crispy-forms>=2.0]
├── django-dirtyfields==1.9.2 [requires: Django>=2.0]
├── django-extensions==3.2.3 [requires: Django>=3.2]
├── django-model-utils==4.3.1 [requires: Django>=3.2]
├── django-picklefield==3.1 [requires: Django>=3.2]
├── django-plotly-dash==2.2.2 [requires: Django>=3.2,<5.0.0]
└── django-sql-explorer==3.2.1 [requires: Django>=3.2.12]