chore: Upgrade Python requirements + Drop support for Python 3.8 #341

Job	Run time
Tests (ubuntu-20.04, 3.11, quality)	42s
Tests (ubuntu-20.04, 3.11, docs)	35s
Tests (ubuntu-20.04, 3.11, django42-drf315)	37s
Tests (ubuntu-20.04, 3.11, django42-drflatest)	39s
Tests (ubuntu-20.04, 3.12, quality)	51s
Tests (ubuntu-20.04, 3.12, docs)	38s
Tests (ubuntu-20.04, 3.12, django42-drf315)	52s
Tests (ubuntu-20.04, 3.12, django42-drflatest)	49s
Tests (ubuntu-latest, 3.11, quality)	42s
Tests (ubuntu-latest, 3.11, docs)	27s
Tests (ubuntu-latest, 3.11, django42-drf315)	44s
Tests (ubuntu-latest, 3.11, django42-drflatest)	40s
Tests (ubuntu-latest, 3.12, quality)	49s
Tests (ubuntu-latest, 3.12, docs)	40s
Tests (ubuntu-latest, 3.12, django42-drf315)	46s
Tests (ubuntu-latest, 3.12, django42-drflatest)	45s
	11m 16s

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