requirements: update Django to 4.2 LTS + deps
Django 3.2 is EOL in April 2024, so let's update to Django 4.2 which should be supported until 2026.
Closes: #48
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Django 3.2 is EOL in April 2024, so let's update to Django 4.2 which should be supported until 2026.
Closes: #48